What Can You Power With A Car Battery? Appliances, Emergency Uses, And Projects [Updated On- 2024]

You can power devices with a car battery using an inverter, which changes 12V DC into 115V AC. This allows you to run small power devices, like a fridge, for a short time. Always use a fuse for safety. Remember, car batteries need recharging after use and are designed primarily for vehicle applications.

During emergencies, car batteries serve as a reliable power source. They can provide electricity during a power outage or natural disaster. People often use them to charge cell phones and other essential devices. Additionally, a car battery can power a small inverter. This inverter can convert DC electricity to alternating current (AC), allowing users to run larger appliances like laptop computers or televisions.

Car batteries can also support various DIY projects. Hobbyists often use them for remote-controlled devices and robotics. Others might employ car batteries for solar power systems.

Understanding how to safely utilize a car battery opens up many possibilities. Next, we’ll explore safety precautions and the best methods to connect appliances to a car battery. This knowledge ensures efficient and secure usage in all applications.

What Is a Car Battery and How Does It Work?

A car battery is an electrochemical device that stores and supplies electrical energy to start a vehicle and power its electrical systems. It primarily uses lead-acid chemistry to convert chemical energy into electrical energy.

According to the U.S. Department of Energy, “A car battery is a rechargeable battery that supplies electric energy to a vehicle’s electrical system.” It is essential for starting the engine and powering lights, radio, and onboard computers when the engine is not running.

A car battery contains six cells filled with an electrolyte solution, usually sulfuric acid and water. Each cell produces about 2 volts. When the battery discharges, a chemical reaction occurs between the lead plates and the electrolyte, generating electrical energy. When recharging, an external power source reverses the reaction, restoring chemical potential.

The Consortium for Energy Efficiency describes the battery as, “A core component in the operation of most modern automobiles.” It emphasizes the battery’s role in both starting the engine and maintaining the power supply when the engine is idle.

Factors that can affect a car battery’s performance include temperature extremes, frequent short trips, and parasitic drains from electronic systems. Over time, these elements can lead to reduced capacity and lifespan.

According to the Battery Council International, approximately 15% of car batteries are replaced each year in the United States, with many failing within three years due to environmental factors and battery design limitations.

The implications of battery failure can include roadside emergencies and increased demand for battery recycling programs, which can cause environmental harm if not managed properly.

In the societal context, battery issues can lead to frustrations for drivers and increased reliance on automotive services. Economically, frequent replacements can burden consumers.

For example, in colder climates, batteries often fail when exposed to frigid temperatures, leading to a spike in demands for battery services.

To mitigate battery-related problems, the American Automobile Association recommends regular battery checks, maintaining clean terminals, and ensuring proper charging practices.

Strategically, adopting advancements in battery technology, such as lithium-ion alternatives and improved recycling methods, can enhance performance and sustainability in the automotive sector.

What Types of Energy Does a Car Battery Provide?

A car battery primarily provides electrical energy to start the engine and power electrical components in a vehicle.

Starting the engine
Powering electrical accessories
Supplying power for auxiliary devices
Supporting hybrid and electric vehicle functions

The versatility of car batteries allows them to serve multiple functions, leading to different perspectives on their usage in various settings.

Starting the Engine: A car battery provides the necessary electrical energy to crank the engine and allow the vehicle to start. Typically, a car battery is a lead-acid type, which generates between 12.4 to 12.7 volts. This voltage is ideal for igniting the fuel-air mixture in the engine. According to the National Highway Traffic Safety Administration (NHTSA), a charged car battery can start most engines by delivering about 300 to 600 amps.
Powering Electrical Accessories: A car battery supplies energy for various electrical accessories, such as headlights, radio, air conditioning, and power windows. When the engine is off, these accessories draw power directly from the battery. Prolonged use without the engine running can deplete the battery, leading to what is often referred to as “battery drain.” Research from the Society of Automotive Engineers emphasizes the need for responsible management of electrical loads to ensure battery longevity.
Supplying Power for Auxiliary Devices: Car batteries can power auxiliary devices like inverters and chargers for phones or laptops. Many users adapt their car batteries to support portable devices during camping or outdoor activities. A standard car battery can feed an inverter to convert the DC output to AC for powering home electronics. This versatility has been underscored by usage trends in DIY communities focusing on mobile power sources.
Supporting Hybrid and Electric Vehicle Functions: In hybrid and electric vehicles, car batteries play critical roles as rechargeable energy storage systems. These advanced batteries support the electric drive motor and energy management systems, enabling the vehicle to operate in electric-only mode or to assist the gasoline engine. The U.S. Department of Energy indicates that the growing adoption of electric vehicles necessitates advancements in battery technology, including improved energy density and faster charging rates.

This comprehensive view illustrates the multifaceted roles of car batteries in modern vehicles and beyond.

What Appliances Can You Power with a Car Battery?

You can power various appliances with a car battery, primarily through inverter use. Common examples include small electronics, lighting, and emergency devices.

Small electronics (laptops, phones, tablets)
Lighting (LED lights, work lights)
Kitchen appliances (blenders, coffee makers)
Power tools (drills, saws)
Emergency devices (radios, battery chargers)
Recreational equipment (coolers, fans)

While many people benefit from powering these devices using a car battery, some argue that inverter efficiency can vary. In some cases, bulky inverters may not provide sufficient power for larger appliances.

Small Electronics: Small electronics, such as laptops and phones, can be powered effectively by a car battery. These devices require lower voltage levels for charging. By using a suitable inverter, users can convert the car battery’s 12 volts to a compatible voltage for these gadgets. According to a 2021 study by the University of California, Riverside, car batteries can charge devices like laptops rapidly and reliably. Using quality converters helps maintain a safe charge.
Lighting: Lighting options, particularly LED lights, easily utilize car batteries. These lights consume significantly less power compared to traditional bulbs, making them suitable for extended use. A standard car battery can power multiple LED lights for hours, providing a good solution for camping or emergency lighting. The National Renewable Energy Laboratory (NREL) reported in 2020 that LED lights are up to 80% more efficient than incandescent bulbs, making them ideal for car battery setups.
Kitchen Appliances: Select kitchen appliances can also be powered with a car battery. Blenders and coffee makers that require low wattage can function well with an appropriate inverter. A 2018 study from the Food Science Institute noted that portable blenders could operate effectively with a 12-volt system when using a power inverter designed for smaller appliances. However, high-watt appliances like microwaves need cautious consideration due to significant power demands.
Power Tools: Car batteries can power many portable power tools, such as drills and saws. Battery-operated tools often match the voltage output of a car battery, making this application common among DIY enthusiasts. According to the Power Tool Institute, tools rated at 12 volts usually suit simple automotive or home repairs, proving effective when paired with a robust inverter setup.
Emergency Devices: Car batteries serve as a reliable power source for emergency devices such as battery chargers and radios. In critical situations, these devices draw minimal power, allowing them to operate for extended periods. A survey conducted by the American Red Cross in 2022 highlighted that during power outages, 67% of respondents used car batteries to power radios and chargers for communication and information access.
Recreational Equipment: Recreational equipment, such as portable coolers and fans, can be powered with a car battery. These items generally require lower energy levels, making them compatible with car batteries. According to a report by the International Camping and Caravanning Club, utilizing a car battery for recreational gear has gained popularity among campers and tailgaters, providing convenience and comfort in outdoor settings.

In summary, a car battery can effectively power a variety of lightweight appliances and devices with appropriate inverters. Each application may come with specific considerations regarding power requirements, making it essential to evaluate the wattage of each appliance before use.

Which Household Appliances Are Compatible with a Car Battery?

Many household appliances can run on a car battery, including small devices designed for low power consumption.

Portable LED lights
Small fans
Portable refrigerators or coolers
Mobile phone chargers
Miniature power tools
Electric blankets
Inverters for larger appliances
Air pumps for inflating items

In considering which appliances can connect to a car battery, we can look at each option’s compatibility, capacity, and efficiency.

Portable LED Lights: Portable LED lights are popular choices to use with car batteries. They provide bright illumination and consume very little power. Many models are designed for camping or emergency use and can easily be charged or powered with a 12V car battery.
Small Fans: Small portable fans can provide a breeze in hot conditions. They usually require 12V DC power, which makes them compatible with typical car batteries. These fans are useful in camping situations or during power outages.
Portable Refrigerators or Coolers: Some portable refrigerators run on 12V DC. They are designed to be energy-efficient and may not draw too much current. Data from appliance testing labs indicate that typical models can maintain low temperatures without excessively draining a car battery.
Mobile Phone Chargers: Mobile phone chargers that support 12V connections can be used with car batteries. Many newer models include USB adapters, making them versatile for various devices.
Miniature Power Tools: Some small power tools can function on a car battery using the correct adapters. For instance, cordless drills with compatible voltage ratings can operate effectively for short tasks.
Electric Blankets: Electric blankets with a 12V power input are ideal for use while camping or in vehicles during cold weather. They provide warmth while being energy-efficient.
Inverters for Larger Appliances: An inverter allows you to convert DC power from the car battery to AC power. This setup enables larger household appliances, such as televisions or microwaves, to be powered temporarily, provided the inverter supports the necessary wattage.
Air Pumps for Inflating Items: Air pumps designed to work with 12V car batteries are efficient for inflating tires or air mattresses. These pumps typically have a simple connection and quick startup.

Understanding these appliance options helps consumers evaluate the best use of a car battery. This information can guide those preparing for emergencies or seeking portable solutions.

What Power Tools Can Be Operated Using a Car Battery?

You can operate various power tools using a car battery. These tools typically require a 12-volt power supply, which is what car batteries provide.

The main power tools that can be operated using a car battery include:
1. Cordless drills
2. Saws (circular, reciprocating, and jigsaws)
3. Air compressors
4. Work lights
5. Electric wrenches
6. Nail guns
7. Heated jackets

While many agree on the efficiency of using a car battery for these tools, some experts caution about using a battery that may be drained beyond its capacity. This can shorten its lifespan and may leave your vehicle unable to start.

1. Cordless Drills:
Cordless drills run on a rechargeable battery, often 12 or 18 volts. By connecting to a car battery, you can extend the use of your cordless drill when working away from traditional power sources. The versatility of cordless drills makes them essential in construction and home improvement projects.

2. Saws (Circular, Reciprocating, and Jigsaws):
Saws, including circular saws, reciprocating saws, and jigsaws, can operate using a car battery. A circular saw requires considerable power, which a standard battery can provide for short periods. These tools are vital for cutting wood, metal, and various materials in projects.

3. Air Compressors:
Using a car battery to power air compressors is practical for inflating tires or operating pneumatic tools. Specific models are designed to connect directly to a car battery for portability and convenience. This functionality is particularly useful during emergencies or remote job sites.

4. Work Lights:
Work lights can easily connect to car batteries, providing illumination in dark areas. Many LED work lights are energy-efficient and can last minutes to hours, depending on battery capacity. They are essential for nighttime work or in poorly lit conditions.

5. Electric Wrenches:
Electric wrenches, or impact wrenches, can be powered by car batteries to simplify loosening or tightening bolts and nuts. They are commonly used in automotive repair and construction work. These tools save time and effort compared to manual wrenches.

6. Nail Guns:
Nail guns require significant power, making car batteries an excellent alternative where AC power is unavailable. These tools speed up the construction process and ensure efficient fastening of materials. Battery-operated nail guns are especially popular on job sites.

7. Heated Jackets:
Battery-powered heated jackets can be connected to a car battery for warmth during cold weather. Workers in outdoor settings appreciate this benefit. It provides a level of comfort that enhances productivity under challenging conditions.

In summary, various power tools can run efficiently on a car battery, benefiting those who work in remote areas or require a portable power source.

What Are the Emergency Uses for a Car Battery?

The emergency uses for a car battery include providing power during outages, jump-starting vehicles, and operating essential devices.

Powering essential appliances during outages
Jump-starting a dead vehicle
Operating emergency lights and notifications
Supplying power to medical devices
Supporting portable power needs for various tools

The various emergency uses for a car battery highlight its versatility and importance in critical situations.

Powering Essential Appliances During Outages:
Powering essential appliances during outages involves using a car battery as a temporary power source when conventional electricity is unavailable. This can include lighting, refrigeration, and communications devices. A car battery typically provides 12 volts of electricity, which can be easily converted for use with small appliances. For example, in a blackout, a car battery can keep a small LED lamp operational, ensuring visibility and safety indoors.
Jump-Starting a Dead Vehicle:
Jump-starting a dead vehicle is an essential emergency use for a car battery. This process requires connecting the dead battery of a vehicle to a functioning battery using jumper cables. When the working battery supplies power, it can restart the engine of the dead vehicle. According to the American Automobile Association (AAA), nearly 6 million jump-starts occur in the U.S. annually, underscoring the car battery’s role in providing rapid assistance.
Operating Emergency Lights and Notifications:
Operating emergency lights and notifications involves using a car battery to power alert systems during crises. Flashing emergency lights and alarms can draw power from a car battery, enabling safety and communication in emergencies. For instance, volunteer fire departments often use car batteries to power portable lights, ensuring visibility during nighttime emergencies.
Supplying Power to Medical Devices:
Supplying power to medical devices is another critical emergency use of a car battery. During power outages or in emergency situations, devices like oxygen concentrators and portable ventilators may rely on car batteries to function. A study by the National Health Service (NHS) in 2019 emphasizes the importance of backup power sources for medical equipment, especially for patients with life-sustaining needs.
Supporting Portable Power Needs for Various Tools:
Supporting portable power needs for various tools means using a car battery to power electric tools and personal devices in remote locations or emergency circumstances. Tools such as drills, saws, or portable chargers for phones can run temporarily off a car battery, making it valuable for DIY projects or emergency repairs. According to a 2020 market report by Allied Market Research, the use of car batteries for portable power solutions is on the rise, reflecting their increased demand in emergency preparedness scenarios.

How Can a Car Battery Provide Backup Power During a Power Outage?

A car battery can provide backup power during a power outage by using stored electrical energy to operate small appliances and devices. This process relies on the battery’s stored capacity, inverter technology, and the connection methods employed for power transfer.

Stored energy: Car batteries, typically lead-acid types, store electrical energy as chemical energy. They can deliver this power when needed, making them suitable for backup use.
Inverter technology: An inverter converts the direct current (DC) output from the car battery into alternating current (AC), which is the type of electricity used by most household appliances. Without an inverter, the battery’s power cannot be used effectively for common devices.
Connection methods: Users can connect appliances to the battery through various methods. For instance, a power inverter can be linked to the battery’s terminals, allowing for safe power transfer. Additionally, some use jump starters with built-in AC outputs to power essential devices during an outage.
Capacity and limitations: A standard car battery can typically provide around 12 volts of DC power with a capacity of between 40 and 100 amp-hours. The amount of time the battery can provide power depends on the total wattage of the connected devices. For example, a device using 100 watts would deplete a 100 amp-hour battery in about 10 hours if transformed efficiently.
Safety concerns: It is essential to take precautions while using a car battery for power. Proper ventilation is crucial to avoid the buildup of harmful gases emitted during use. Additionally, overloading the battery can lead to battery failure or even damage.

Overall, while a car battery cannot replace a full home backup generator, it can serve as a temporary power source for critical needs during a power outage. Understanding its capacity and operational methods ensures safe and effective use.

What Safety Devices Can Be Supported by a Car Battery in Emergencies?

A car battery can support various safety devices in emergencies, including lights, alarms, and communication devices.

Emergency Lights
Warning Alarms
Mobile Phone Chargers
Portable Air Pumps
First Aid Equipment

In addition to the types of devices mentioned, the specific usage and relevance of each can vary greatly depending on the emergency context.

Emergency Lights: Emergency lights provide illumination during power outages or when a vehicle breaks down. These lights help ensure visibility and safety in low-light situations. For instance, many users employ LED flashlights or lanterns powered by a car battery. A study by the National Highway Traffic Safety Administration (NHTSA) shows that well-lit areas significantly reduce the risk of accidents, particularly at night.
Warning Alarms: Warning alarms alert individuals to potential hazards. These alarms can include carbon monoxide detectors or other types of alert systems that signal unsafe conditions. For example, a battery-supported smoke detector can provide crucial warnings in case of a fire. The U.S. Fire Administration states that smoke detectors reduce the risk of fatal house fires by almost 50%.
Mobile Phone Chargers: In emergencies, maintaining communication is essential. Car batteries can power portable mobile phone chargers. This allows individuals to charge their phones for critical communication, such as calling for help or contacting loved ones. According to the Pew Research Center, about 97% of Americans own a cell phone, reinforcing the importance of staying connected during emergencies.
Portable Air Pumps: Portable air pumps help maintain tire pressure when traveling in emergencies. A car battery can power these pumps, ensuring a vehicle is safe to drive. For instance, many drivers keep a portable air compressor in their vehicles for unexpected flat tires. Research by the AAA indicates that proper tire maintenance can reduce the likelihood of tire blowouts or accidents.
First Aid Equipment: First aid kits with electronic components can also be powered by car batteries. This includes devices like automated external defibrillators (AEDs), which can be crucial in life-threatening situations. The American Heart Association highlights that having AEDs accessible can significantly increase survival rates for cardiac arrest victims.

In summary, a car battery can effectively power various safety devices in emergencies, enhancing individual and public safety.

How Can You Utilize a Car Battery for DIY Projects?

You can utilize a car battery for DIY projects by powering various devices, creating backup power systems, and experimenting with electronics.

Powering devices: Car batteries provide a stable 12-volt power supply. Many portable devices, such as portable lights, fans, and radio systems, can run on this voltage. For example, connecting a 12-volt LED light to a car battery can illuminate an area during power outages.

Creating backup power systems: Car batteries serve as excellent backup power sources. They can maintain power for critical appliances in emergencies. For instance, a battery can keep a small refrigerator running for hours if the main power fails. According to the National Fire Protection Association (NFPA, 2022), using deep-cycle batteries in a backup system can enhance safety and longevity.

Experimenting with electronics: A car battery allows for experimentation with various electronic projects. Hobbyists can use it to test solar panel systems, build a DIY battery bank, or create electric vehicle prototypes. The versatility of a car battery makes it ideal for learning about circuits and energy storage. The Electronics Journal in 2021 highlighted its utility in educational settings as a hands-on learning tool.

Using a car battery in DIY projects can provide practical power solutions and serve as an engaging way to learn about electrical devices and systems.

How Can You Build a Portable Power Station with a Car Battery?

You can build a portable power station using a car battery by connecting it to an inverter and incorporating necessary components for safe and efficient power output. This setup enables you to utilize the battery’s stored energy for various applications.

To create a portable power station with a car battery, follow these detailed steps:

Select a car battery: Choose a deep-cycle battery, as it is designed for repeated discharges. Unlike standard car batteries, deep-cycle batteries can provide sustained power without damage. According to the Battery University (2018), deep-cycle batteries can discharge up to 80% of their capacity, making them more suitable for extended use.
Acquire an inverter: An inverter converts the direct current (DC) power from the car battery into alternating current (AC) power. You need a pure sine wave inverter for sensitive electronics, while a modified sine wave inverter will suffice for simpler devices. A study by the U.S. Department of Energy (2021) emphasizes the importance of a good-quality inverter to ensure efficiency and safety during the power conversion process.
Connect the inverter: Use proper gauge wires to connect the inverter to the battery. The wire gauge depends on the distance and current capacity. For instance, a 10-gauge wire is suitable for a distance of up to 10 feet with a load of 1000 watts. Always ensure connections are secure to prevent voltage drops.
Add fuses or circuit breakers: Install a fuse or circuit breaker to protect against overload and prevent potential mistakes. Choose a fuse rated for your inverter’s maximum output to minimize fire risks. The National Electrical Code (NEC) recommends using fuses rated at 125% of the circuit’s continuous load.
Include battery monitoring: Incorporate a battery monitor to track voltage and remaining charge levels. This tool helps prevent over-discharging the battery, which can shorten its lifespan. According to the International Journal of Energy Research (2020), maintaining a charge between 50% and 80% enhances the overall life of lead-acid batteries.
Test your setup: Before using the power station for multiple devices, perform a test run. Connect a small load to check the functionality and ensure the inverter operates correctly. Monitoring the initial performance can help identify potential issues early.

Following these steps will help you build a functional portable power station with a car battery. This setup provides a reliable power source for camping, emergency situations, or powering small appliances off-grid.

What Are Some Creative Ways to Repurpose an Old Car Battery?

Repurposing an old car battery can provide creative and practical solutions. Here are some ways to consider using an old car battery effectively:

Solar Power Storage
Emergency Power Supply
DIY Smart Tools
Home Gardening
Electric Bike or Scooter Power
Art and Decor

Repurposing an old car battery offers various creative solutions, attracting different perspectives and suggestions. While some view this practice as eco-friendly and resourceful, others caution against safety and environmental concerns.

Solar Power Storage: Repurposing an old car battery for solar power storage involves using the battery to store energy generated from solar panels. This setup allows users to harness solar energy for home use, reducing reliance on grid electricity. Many homeowners have successfully created off-grid systems using this method. According to a 2021 report by the National Renewable Energy Laboratory (NREL), using efficient battery systems can enhance the viability of renewable energy sources.
Emergency Power Supply: An old car battery can serve as an emergency power supply during power outages. Many users connect the battery to a power inverter, which converts DC electricity from the battery into AC electricity for household appliances. The American Red Cross advocates keeping batteries charged and ready for emergencies to provide essential power.
DIY Smart Tools: Repurposing can include creating smart tools powered by an old car battery. For example, makers can convert batteries to run portable tools or DIY projects in workshops. This practice fosters innovation and can reduce costs for hobbyists, as noted in studies by the Maker Media in 2020, which found that DIY electronics projects promote engineering skills.
Home Gardening: An old car battery can serve as a power source for garden projects. Users can create automated watering systems or use it for grow lights in indoor gardening. This eco-friendly approach promotes sustainable gardening practices while utilizing materials that would otherwise be discarded.
Electric Bike or Scooter Power: Repurposing an old car battery for electric bikes or scooters is a popular option. Users connect the battery to the motor, offering a cost-effective way to power electric mobility devices. According to Consumer Reports, converting standard bikes and scooters to electric power with repurposed batteries can decrease both emissions and costs.
Art and Decor: Artists can create sculptures, furniture, or decor items using old batteries. This approach highlights creativity and sustainability in art. Many local art collectives have showcased this practice, emphasizing the beauty of transforming waste materials into new forms.

Remember to take appropriate safety measures when handling old car batteries, as they can contain hazardous materials.

What Precautions Should You Take When Using a Car Battery for Powering Devices?

When using a car battery to power devices, several precautions should be taken to ensure safety and functionality.

Confirm voltage requirements.
Use appropriate adapters and connections.
Avoid overloading the battery.
Monitor temperature and ventilation.
Maintain proper battery health.
Use a fuse or circuit breaker.
Avoid short circuits.
Store the battery correctly.

Taking these precautions will help protect the battery and the devices connected to it. Now, let’s explore each precaution in detail to understand their importance and application.

Confirm Voltage Requirements: Confirming voltage requirements is essential when using a car battery. Most car batteries deliver 12 volts. Verify that the devices you plan to power are compatible with this voltage. Using devices that require a higher voltage can lead to damage or malfunction.
Use Appropriate Adapters and Connections: Using appropriate adapters and connections ensures a secure and efficient power connection. Poor connections can cause sparks or overheating. Choose connectors rated for the current your devices require. For example, a high-quality cigarette lighter adapter can safely provide power for smaller devices.
Avoid Overloading the Battery: Avoiding overload is crucial to prolong the battery’s lifespan. Each car battery has a specific amp-hour capacity. Exceeding this can quickly discharge the battery and may cause it to fail. For instance, if the battery is rated for 50 amp-hours, only connect devices that cumulatively draw significantly less than that.
Monitor Temperature and Ventilation: Monitoring temperature and ensuring proper ventilation is important for safety. Car batteries can generate heat during use, leading to potential hazards like leaks or ruptures. Always use the battery in a well-ventilated area to dissipate heat. According to the Battery Council International, temperatures exceeding 140°F can damage the battery’s internal components.
Maintain Proper Battery Health: Maintaining proper battery health involves regularly checking the battery for corrosion, leaks, or wear. A healthy battery functions better and reduces the risk of failure during use. Consider checking the electrolyte levels and terminals to ensure optimal condition.
Use a Fuse or Circuit Breaker: Using a fuse or circuit breaker protects both the battery and devices from surges. A fuse will blow if the current exceeds its rating, preventing potential damage. This small investment can save you from costly repairs or device replacement.
Avoid Short Circuits: Avoiding short circuits is paramount for safety. A short circuit occurs when current flows along an unintended path, which can cause sparks or fires. Ensure that wires are properly insulated and connections are secure.
Store the Battery Correctly: Storing the battery correctly extends its life. Keep it in a cool, dry place away from moisture and direct sunlight. Maintaining the battery in an upright position prevents leaks and ensures safe handling.

Following these precautions will enhance safety and efficiency while using a car battery to power devices.

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