Revive a Weak AGM Battery: Proven Methods to Bring Back Power and Restore Charge

To revive a weak AGM battery, connect it in parallel to a good battery using jumper cables. Attach the charging leads to the functioning battery’s terminals. Turn on the charger and let it charge for one hour. After charging, turn off the charger, disconnect all cables, and check for warmth at the terminals to ensure a good connection.

Another effective method involves the use of Epsom salt. Dissolving Epsom salt in distilled water and adding it to the battery cells can improve performance. Ensure the battery is fully charged before applying this solution. Additionally, regular maintenance, such as cleaning terminals and checking for corrosion, can prolong the battery’s life.

By following these steps, you can revive a weak AGM battery and restore its charge. This process not only revives the battery but also enhances its longevity. Now that we understand how to restore an AGM battery, let’s explore preventive measures to avoid battery degradation in the first place.

What Is a Weak AGM Battery and How Can It Be Revived?

A weak AGM battery is a lead-acid battery that has lost its ability to hold charge effectively. This condition is often indicated by a significant drop in voltage or reduced performance during use. An absorbed glass mat (AGM) battery is known for its reliability and efficient energy storage.

The Battery Council International (BCI) defines AGM batteries as “sealed lead acid batteries that use a fiberglass mat to absorb the electrolytic solution, which helps prevent spillage and allows for flexible installation.” AGM batteries can provide high power output and deep discharge cycles.

A weak AGM battery may result from several factors, such as deep discharges, prolonged inactivity, or insufficient charging. Aging can also contribute to reduced battery capacity and lifespan. Additionally, high operating temperatures can accelerate deterioration.

Research from the U.S. Department of Energy indicates that properly maintained AGM batteries can last up to 7 to 10 years. However, poorly maintained batteries may only last 3 to 5 years, potentially leading to increased replacement costs.

The consequences of weak AGM batteries can include decreased vehicle performance and increased environmental waste. Proper disposal is essential to prevent harmful chemicals from leaking into ecosystems.

Weak AGM batteries affect health and safety by increasing the likelihood of accidents. Society faces potential economic burdens, as frequent replacements lead to increased costs for consumers and waste management issues.

To revive a weak AGM battery, experts recommend equalizing the charge by using a smart charger. Maintenance includes regular inspections, avoiding deep discharges, and ensuring proper storage conditions.

Strategies include keeping batteries at optimal temperatures, using battery maintainers, and following manufacturer guidelines for charging. Implementing these practices can extend battery life and reduce environmental impact.

What Are the Common Symptoms of a Weak AGM Battery?

The common symptoms of a weak AGM (Absorbent Glass Mat) battery include reduced cranking power, longer recharge times, and physical signs of damage.

1. Reduced cranking power
2. Longer recharge times
3. Sulfation
4. Physical swelling
5. Inconsistent performance

The symptoms listed above can vary in intensity. It’s essential to understand each symptom to determine the battery’s overall health.

1. Reduced Cranking Power: A weak AGM battery shows reduced cranking power. This means the engine may turn over slowly or may not start at all. This symptom typically indicates that the battery cannot hold enough charge to supply the necessary power for starting the engine. According to the Battery Council International, a fully charged AGM battery should typically provide 12.6 volts to 13.0 volts. If the voltage drops significantly, it is a clear sign of weakness.

2. Longer Recharge Times: A weak AGM battery often takes longer to recharge fully. If the battery requires more than the usual time to reach a full charge after being depleted, it may indicate internal damage or capacity loss. Experts at Consumer Reports recommend checking the battery’s state of charge after charging to ensure it reaches expected levels. Uneven charging times can impact performance significantly.

3. Sulfation: Sulfation occurs when lead sulfate crystals form on the battery plates. This condition happens when the battery remains in a discharged state for an extended period. Sulfation reduces the battery’s ability to recharge effectively and can lead to permanent damage. A study by the Journal of Power Sources suggests that sulfation can significantly affect battery life, potentially reducing it by 30% or more if not addressed.

4. Physical Swelling: Physical swelling is a visible symptom of a compromised AGM battery. A swollen battery case can indicate overcharging, excessive heat, or internal damage. Swelling can cause the battery to leak or even burst, posing safety risks. The Engineering Toolbox states that once swelling occurs, the battery should be replaced immediately for safety reasons.

5. Inconsistent Performance: A weak AGM battery may exhibit inconsistent performance during operation. This can manifest as sudden drops in voltage or power loss, particularly under load. A report by the National Renewable Energy Laboratory indicates that inconsistent performance can lead to unexpected failures in electronic systems reliant on stable power supply, such as navigation systems or critical electrical components in vehicles.

Understanding these symptoms is essential for maintaining AGM batteries. Regular checks can help identify issues before they lead to system failures.

How Do Environmental Factors Impact AGM Battery Weakness?

Environmental factors significantly impact AGM battery performance, leading to weaknesses such as reduced capacity, shorter lifespan, and decreased efficiency. These factors include temperature extremes, humidity levels, and exposure to corrosive elements.

• Temperature extremes: AGM batteries operate best at moderate temperatures. High temperatures can accelerate chemical reactions, causing overheating and damaging the internal components. A study by the Battery University (2020) shows that for every 10 °C increase in temperature, the lifespan of a lead-acid battery decreases by 50%. Conversely, very low temperatures reduce the battery’s ability to deliver power efficiently, as the electrolyte becomes more viscous, leading to increased internal resistance.

• Humidity levels: High humidity can lead to condensation within battery environments. This moisture can corrode terminals and internal connections, degrading performance. The National Renewable Energy Lab (NREL, 2021) stated that humidity impacts battery performance by altering the chemical interactions within the battery, leading to reduced overall efficiency.

• Exposure to corrosive elements: AGM batteries are sealed, but exposure to corrosive elements, such as salt from coastal environments or road salt used in winter months, can lead to external damage. This damage can compromise the seals and lead to reduced effectiveness. Research from the Journal of Power Sources (Smith, 2022) highlights how corrosive environments accelerate degradation rates of external battery components, leading to premature failure.

Due to these environmental factors, AGM batteries may experience significant weaknesses in capacity, efficiency, and longevity. Appropriate storage and usage conditions can mitigate these impacts.

What Methods Are Effective for Reviving a Weak AGM Battery?

The effective methods for reviving a weak AGM battery include controlled charging, equalizing charge, desulfation, and checking connections and terminals.

1. Controlled charging
2. Equalizing charge
3. Desulfation
4. Checking connections and terminals

To understand the efficacy of these methods, it is important to explore each one in detail.

1. Controlled Charging: This method involves using a battery charger that can provide a low and steady charge to the AGM battery. Controlled charging helps to prevent overheating and overcharging. It allows the battery to draw in energy gradually, which can help restore its capacity. According to a study by Battery University in 2021, maintaining a charge of around 14.4 volts can prolong the life of AGM batteries.

2. Equalizing Charge: An equalizing charge involves applying a higher voltage than normal for a short period. This process helps balance the voltage levels between the individual cells in multi-cell batteries. The purpose is to prevent sulfation, which occurs when lead sulfate crystals form on the plates. This method typically occurs at the end of the charging cycle. Experts recommend this process every 30 cycles to maintain battery health.

3. Desulfation: Desulfation refers to the removal of lead sulfate buildup on battery plates. This can be achieved through specialized desulfation chargers that apply short pulses of current. This technique helps restore lost efficiency by reversing the sulfation process. A 2019 study by Electrochemical Society indicated that regular desulfation can increase battery performance by up to 25%.

4. Checking Connections and Terminals: Weak connections and corroded terminals can impede charging efficiency. Regular inspections of battery terminals for corrosion and ensuring tight connections are vital for maintaining battery health. Cleaning terminals with a mixture of baking soda and water can help minimize corrosion. This simple maintenance task can significantly improve the performance of an AGM battery.

By using a combination of these methods, users can effectively revive a weak AGM battery and extend its service life.

How Does Slow Charging Work for a Weak AGM Battery?

Slow charging works effectively for a weak Absorbent Glass Mat (AGM) battery by gradually restoring its energy without causing further damage. The AGM battery is a type of lead-acid battery that uses fiberglass mats to absorb the electrolyte. This design allows for efficient energy storage and makes the battery resistant to vibration and spillage.

To charge a weak AGM battery slowly, follow these steps:

1. Select a compatible charger. Use a charger specifically designed for AGM batteries. This charger will provide the correct voltage and charging profile.

2. Connect the charger. Attach the positive (red) clamp to the battery’s positive terminal and the negative (black) clamp to the negative terminal. Ensure a secure connection to prevent sparks.

3. Set the charging mode. Many chargers have a setting for AGM batteries. Choose the slow charge option, which typically provides a lower current rate. This helps to reduce heat buildup during charging.

4. Monitor the battery. Check the battery’s voltage and temperature periodically. Ensure that the battery does not overheat. If the battery temperature rises too high, it may indicate a need to stop charging.

5. Complete the charging cycle. Allow the battery to charge for an extended period, often several hours, to ensure it reaches full capacity. Slow charging helps to evenly distribute the charge and restore the battery’s chemical balance.

Slow charging benefits a weak AGM battery by minimizing stress on the cells. This process extends the battery’s lifespan and improves its overall performance. It avoids the risks associated with rapid charging, such as overheating and sulfation, which can further weaken the battery. In summary, slow charging effectively revitalizes a weak AGM battery by applying a careful, steady energy input.

What Is Equalization Charging and How Can It Help My Weak AGM Battery?

Equalization charging is a controlled overcharging process applied to lead-acid batteries, including Absorbent Glass Mat (AGM) types, to balance cell voltages and improve overall battery health. This technique helps to restore battery performance and capacity by ensuring all cells reach their full charge.

According to the Battery University, equalization charging is essential in prolonging battery life and optimizing performance. They highlight that this method can enhance the uniformity of charge across all battery cells, reducing the risk of sulfation and stratification.

The process involves raising the battery voltage slightly above the normal operating level for a specific period. This promotes even distribution of charge and prevents sulfation, a condition where lead sulfate crystals build up, hindering the battery’s ability to hold a charge. Regular equalization cycles contribute to maintaining capacity and extending service life.

The National Renewable Energy Laboratory describes equalization charging as a critical maintenance practice for lead-acid batteries, preventing premature aging due to inconsistent charging cycles. Such practices can mitigate the negative effects caused by undercharging or partial charging.

Causes of weak AGM batteries can include deep discharges, inconsistent charging practices, and temperature variations that affect battery chemistry. Regular maintenance and equalization cycles are essential to counter these issues.

Data from the Battery Research Institute indicates that proper equalization can increase battery life by up to 30% in some cases, helping users avoid costly replacements. It emphasizes the need for regular monitoring and maintenance to ensure optimal battery health.

Neglecting equalization charging can lead to reduced battery efficiency and shortened lifespan, impacting users’ reliance on these energy sources for applications like solar power storage or electric vehicles.

The implementation of equalization charging methods not only improves battery longevity but also promotes energy efficiency. This has implications for reducing waste and extending the use of renewable energy resources.

To effectively address weak AGM batteries, experts recommend scheduling regular equalization processes based on the manufacturer’s guidelines. Monitoring battery state and implementing routine testing are vital for optimal performance.

Technologies like smart chargers that automatically adjust charging cycles based on battery condition can significantly enhance the effectiveness of equalization charging. Regular training for users on battery maintenance is also advantageous in ensuring longevity.

Are There Alternative Methods to Restore AGM Battery Charge?

Yes, there are alternative methods to restore charge to an Absorbent Glass Mat (AGM) battery. AGM batteries are popular for their durability and maintenance-free qualities, but they can sometimes lose charge due to deep cycling or neglect. Using specific charging techniques can help restore their functionality and extend their lifespan.

One alternative method for charging an AGM battery is the use of a smart charger. Smart chargers are designed specifically for different battery types and adapt to the charging requirements of AGM batteries. They use multi-stage charging processes, which gradually bring the battery back to full charge without overloading it. Another option is the equalization charge method. This involves periodically charging the battery at a higher voltage to balance the cell voltages. However, this method should be used cautiously, as it can lead to overheating if not monitored carefully.

The positive aspects of using smart chargers include improved efficiency and prevention of battery damage. According to the Battery Council International, proper charging can significantly enhance the lifespan of AGM batteries. Smart chargers are designed to minimize the risk of overcharging and can often rejuvenate deeply discharged batteries. This not only saves money on replacements but also promotes sustainable practices by prolonging battery life.

On the negative side, improper use of charging methods can lead to potential dangers. For instance, using a standard charger may result in damage or poor performance of AGM batteries. Additionally, if equalization charging is conducted too frequently or at incorrect voltages, it can cause overheating and physical damage to the battery. Expert opinions, such as those from the East Penn Manufacturing Company (2021), emphasize the importance of following manufacturer guidelines to avoid these risks.

For optimal results, consider using a smart charger specifically rated for AGM batteries. Ensure that you monitor the charge levels diligently to prevent overcharging. If your battery is deeply discharged, allow for gradual charging using the appropriate settings. Regular maintenance practices, such as visual inspections and maintaining clean terminals, can also prevent future issues. Tailor your approach to your specific situation to guarantee the best care for your AGM battery.

What Precautions Should Be Considered When Reviving an AGM Battery?

To safely revive an AGM (Absorbent Glass Mat) battery, several precautions should be carefully considered. Following proper guidelines is crucial to prevent damage to the battery and ensure user safety.

Precautions to Consider When Reviving an AGM Battery:
1. Wear protective gear.
2. Use proper charging equipment.
3. Check for battery damage.
4. Ensure adequate ventilation.
5. Monitor voltage levels.
6. Avoid overheating.
7. Use distilled water if needed.

To effectively revive an AGM battery, it is essential to understand these precautions in detail.

1. Wear Protective Gear: Wearing protective gear is fundamental when handling AGM batteries. This includes gloves and safety glasses to protect against acid splashes or accidental shorts. Lead-acid batteries can release harmful gases during charging.

2. Use Proper Charging Equipment: Using the appropriate charger is critical for AGM batteries. An incompatible charger can overcharge the battery, leading to damage. Always choose a smart charger designed for AGM batteries which can adjust the charging current based on the battery’s needs.

3. Check for Battery Damage: Before attempting to revive the battery, inspect it for any physical damage such as swelling, cracks, or leaks. A compromised battery can be hazardous. Dispose of damaged batteries according to local regulations.

4. Ensure Adequate Ventilation: Reviving a battery should be done in a well-ventilated area. AGM batteries can emit gases that are dangerous if inhaled. Ensure the work area allows for proper air circulation.

5. Monitor Voltage Levels: During the revival process, consistently monitor the voltage levels. AGM batteries generally should not exceed specific voltage thresholds. Regular checks help prevent overcharging and prolong battery life.

6. Avoid Overheating: Heating during the charging process can damage AGM batteries. Keep the charger settings within the manufacturer’s recommendations to prevent overheating. If the battery becomes excessively hot, disconnect the charger immediately.

7. Use Distilled Water if Needed: If the AGM battery requires water addition, only use distilled water. Tap water can introduce minerals that can harm the battery. Ensure water levels are within the recommended limits before reviving.

By following these precautions, users can safely and effectively revive an AGM battery, restoring its functionality while minimizing risks.

What Safety Measures Should Be Taken During the Reviving Process?

The safety measures to be taken during the reviving process of a weak AGM battery include personal protective equipment, proper ventilation, following manufacturer guidelines, using appropriate tools, and monitoring for temperature changes.

1. Personal Protective Equipment (PPE)
2. Proper Ventilation
3. Following Manufacturer Guidelines
4. Using Appropriate Tools
5. Monitoring for Temperature Changes

To ensure a safe reviving process, it is crucial to understand each safety measure in detail.

1. Personal Protective Equipment (PPE): Using personal protective equipment is vital during the battery reviving process. PPE includes safety goggles, gloves, and protective clothing to guard against acid splashes and potential electric shock. The National Fire Protection Association (NFPA) recommends wearing acid-resistant gloves and goggles to reduce the risk of injury.

2. Proper Ventilation: Proper ventilation is necessary to avoid the accumulation of harmful gas fumes. Charging batteries can produce hydrogen gas, which is flammable. The Occupational Safety and Health Administration (OSHA) states that adequate airflow can significantly reduce the risk of explosion. Work in an open area or ensure a well-ventilated space when reviving AGM batteries.

3. Following Manufacturer Guidelines: Adhering to manufacturer guidelines ensures safety during the reviving process. Each battery type has specific instructions regarding charging voltages and amperage. Manufacturers provide these guidelines to prevent overcharging and potential damage to the battery or the surrounding environment. Referencing guidelines from industry experts such as the Battery Council International can provide essential information.

4. Using Appropriate Tools: Using the correct tools minimizes the risk of accidents. Common tools include a multimeter for voltage testing and a smart charger designed for AGM batteries. Using inappropriate equipment can lead to incorrect charging and potential hazards, as noted in a study by the Society of Automotive Engineers (SAE).

5. Monitoring for Temperature Changes: Monitoring temperature changes during the charging process is critical. AGM batteries should not exceed the recommended temperature limits, typically around 50°C (122°F). Elevated temperatures can indicate overcharging, which can lead to battery failure or explosion. The Institute of Electrical and Electronics Engineers (IEEE) emphasizes the need for temperature management to ensure safety while working with batteries.

Implementing these safety measures will enhance safety and effectiveness during the AGM battery reviving process.

Is Professional Help Necessary for Reviving Weak AGM Batteries?

No, professional help is not strictly necessary for reviving weak AGM (Absorbent Glass Mat) batteries. However, seeking professional assistance can ensure safe and effective recovery, especially for those unfamiliar with battery maintenance practices. Many users can successfully address minor issues on their own with appropriate tools and knowledge.

When comparing the DIY approach to professional help, one key difference is the level of expertise. DIY methods often involve simple tasks like using a specialized charger designed for AGM batteries. These chargers often have features that prevent overcharging, which is crucial for AGM battery care. In contrast, professionals may utilize advanced diagnostic tools to assess battery health and perform complex repairs. Both approaches can achieve results, but a professional may expedite the recovery process and improve reliability.

The benefits of reviving AGM batteries include cost savings and prolonging battery lifespan. According to a study by the Battery Council International (BCI), properly maintained AGM batteries can last from 4 to 7 years. Reviving a weak battery can save users the expense of purchasing a new one. Additionally, revived batteries contribute to environmental sustainability by reducing hazardous waste from battery disposal.

On the downside, attempting to revive a weak AGM battery can pose risks if not done correctly. Overcharging can lead to stripped cells or explosive failures. The National Fire Protection Association (NFPA) advises against untrained individuals working on batteries without proper safety equipment and knowledge. Incorrect methods can compromise battery performance, potentially leading to premature failure.

To effectively revive a weak AGM battery, consider the following recommendations. First, assess the battery condition using a multimeter; a reading below 12.4 volts indicates a potential issue. Second, use a compatible AGM battery charger, ensuring it has settings designed for AGM technology. Third, watch for signs of physical damage or swelling, indicating the need for professional help. Lastly, regularly maintain your battery by cleaning terminals and checking fluid levels if applicable.

What Tools and Equipment Are Essential for Reviving a Weak AGM Battery?

To revive a weak AGM battery, you will need essential tools and equipment that support its recharge and maintenance.

1. Smart Battery Charger
2. Multimeter
3. Terminal Cleaner
4. Protective Gear
5. Load Tester

Having identified these essential tools, it’s important to understand their roles in effectively reviving an AGM battery.

1. Smart Battery Charger: A smart battery charger is designed to safely charge AGM batteries by controlling the voltage and current. This type of charger prevents overcharging and extends battery life. It often features automatic shut-off and can adjust to the battery’s state of charge. According to a study by the Battery University in 2022, using smart chargers can increase the lifespan of AGM batteries by up to 30%.

2. Multimeter: A multimeter is a diagnostic tool used to measure voltage, current, and resistance. When reviving a weak AGM battery, it can help assess the battery’s state of charge and identify potential issues. For example, a reading below 12.4 volts indicates that the battery needs charging. Proper use of a multimeter can prevent damages caused by incorrect charging, as highlighted in an article by AutoZone in 2021.

3. Terminal Cleaner: A terminal cleaner is a tool used to remove corrosion from battery terminals and cable ends. Clean terminals ensure a proper electrical connection, improving the charging efficiency. The U.S. Department of Energy states that corroded connections can lead to a 10% or more loss in charging effectiveness, leading to quicker battery decline.

4. Protective Gear: Protective gear includes gloves and safety goggles. AGM batteries contain electrolytes that can be harmful if spilled. Using protective gear is essential to ensure safety while handling batteries. OSHA emphasizes that safety gear can significantly reduce the risk of injury when working with chemicals and potential electric shocks.

5. Load Tester: A load tester assesses the battery’s ability to hold a charge under load. This is crucial for determining if the battery can still function correctly after recharging. According to an article by the International Society of Automotive Engineers in 2020, regular load testing can help catch weak batteries before they fail, saving time and money on replacements.

By utilizing these tools and understanding their importance, reviving a weak AGM battery becomes a manageable task.

Which Chargers Are Best for Weak AGM Batteries?

The best chargers for weak AGM batteries include smart chargers, dedicated AGM chargers, and solar panel chargers.

1. Smart chargers
2. Dedicated AGM chargers
3. Solar panel chargers

These options cater to various user needs and situations, creating a diverse landscape of choices for reviving weak AGM batteries. While smart chargers offer advanced features, some users believe dedicated AGM chargers deliver optimal performance for these specific battery types.

1. Smart Chargers:
   Smart chargers are intelligent devices that automatically adjust the charging rates based on battery conditions. Smart chargers typically use a multi-stage charging process, including bulk, absorption, and float modes. For example, the NOCO Genius series features a built-in microprocessor that optimizes the charge for AGM batteries. According to a review by BatteryStuff.com, smart chargers can help extend battery lifespan by preventing overcharging.

2. Dedicated AGM Chargers:
   Dedicated AGM chargers are specifically designed for absorbed glass mat batteries. These chargers use a unique charging algorithm that suits AGM technology, ensuring proper charging and maintaining battery health. The CTEK MXS 5.0 is a prime example of a dedicated AGM charger, providing a controlled charge to prevent damage. Research by the Battery University indicates that using a dedicated AGM charger can significantly enhance the battery’s performance and longevity.

3. Solar Panel Chargers:
   Solar panel chargers harness sunlight to recharge batteries, providing a sustainable and eco-friendly option for AGM charging. These chargers can be particularly useful for outdoor applications or in regions with limited access to electrical outlets. An example is the Renogy 50W Solar Panel, which can effectively charge weak AGM batteries. According to a study by the National Renewable Energy Laboratory (NREL), solar energy technologies can support battery charging while reducing carbon footprints, making them an attractive option for environmentally-conscious users.

What Additional Equipment Enhances the Reviving Process?

The additional equipment that enhances the reviving process of weak AGM (Absorbent Glass Mat) batteries includes specialized tools and accessories.

1. Battery charger with reconditioning mode
2. Voltage meter
3. Load tester
4. Hydrometer (for flooded types)
5. Jump starter

The following points illustrate various equipment that can improve the battery revival process and their specific roles in achieving optimal restoration.

1. Battery Charger with Reconditioning Mode:
   The battery charger with reconditioning mode is a device that can rejuvenate AGM batteries by applying a controlled charge to recover lost capacity. This mode typically delivers pulses or specific voltage levels to help dissolve sulfation, a key factor in battery degradation. According to a study by IEEE Transactions on Power Electronics, battery chargers with advanced features can extend the lifespan of AGM batteries by up to 30%.

2. Voltage Meter:
   The voltage meter is a tool used to measure the resting and load voltage of the battery. An accurate voltage reading helps assess the state of charge and overall health of the battery. Experts note that routinely checking the voltage can prevent further damage and guide effective rejuvenation efforts. For example, a reading below 12.4 volts in an AGM battery may indicate a need for immediate charging or reconditioning.

3. Load Tester:
   The load tester applies a simulated load to the battery to give a clear indication of its ability to deliver current under stress. This testing tool can help identify weak cells or overall capacity issues that may not be apparent during a simple voltage check. According to Battery University, effective load testing can provide insights into whether a battery is recoverable or needs replacement.

4. Hydrometer (for Flooded Types):
   The hydrometer measures the specific gravity of the electrolyte in flooded batteries, which can indicate the state of charge and health of the battery. While AGM batteries are sealed and do not require this tool, understanding its function helps users of traditional flooded batteries appreciate how similar monitoring can benefit AGM types. A well-functioning hydrometer can assist in managing maintenance schedules effectively.

5. Jump Starter:
   The jump starter is a portable device that can provide an immediate energy boost to a weak battery, allowing for a quick restart. While not directly linked to the reviving process, having a jump starter handy can prevent users from facing unexpected breakdowns. Many homeowners regard jump starters as essential for regular vehicle maintenance.

These additional equipment choices enhance the process of reviving AGM batteries. They cater to different aspects of battery health, and their utilization can prevent unnecessary replacements and prolong the life of the battery.

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