How To Keep Boat Batteries Charged?

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Boat batteries can be expensive and hard to replace. How do you keep your boat battery charged? There are several ways to ensure that your batteries stay charged when boating season is underway. Here are a few things you can do to make sure that your boat’s battery stays in good shape for the next outing!

So, how to keep boat batteries charged? The steps to maintaining a boat battery charged include checking the charge monthly, topping up if necessary, never discharging a lead-acid battery below 50%, and adding distilled water.

What type of boat battery do you have?

The four types of marine batteries available are wet cell (flooded), gel, AGM, and lithium.

Wet cells have been around for a long time but come with some downsides such as the risk of explosion from venting gas or liquid that may be present on the battery surface when it is charged too quickly.

Gel-cells do not contain any electrolyte so they cannot experience an overflow spillage problem like their counterparts can; this also means there will always only be one acid type in each container which makes them less susceptible to corrosion than other formulations.

The last two choices are newer innovations; AGMs use glass mats rather than porous paper separators between plates while LiFePO4 batteries replace lead compounds with Lithium Iron Phosphate, which is not toxic to the environment.

If you’re looking for the best battery to power your boat, there’s a type of marine battery for all types. Wet cell (flooded) batteries are cheaper and simpler while gel cells have much less chance of leakage or damage due to overcharging.

A glass mat absorbed is also an option because it has no liquid in it so if they do leak, the fluid won’t spread easily as wet cell batteries do. Finally, as with any other vehicle on land or sea lithium-ion polymer packs last longest but come at a higher cost than their competitors.

The typical lifespan of a boat battery is about three years. Batteries age because they are exposed to the elements, and how often they’re charged or discharged.

All these factors will determine how long your batteries last but if you want them to have more longevity like five or even ten years then use a deep cycle marine battery with high capacity ratings and buy it from reputable brands such as Trojan Battery Co., Exide Technologies LLC, Interstate Batteries Inc., UPG industries, Michelin Group North America LLC(Michelin), Panasonic Corporation (Panasonic).

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Tips To Keep Boat Batteries Charged

Most boats have a battery of some kind for backup, whether it’s onboard and dry charged or off the boat but still in an enclosed space. Following these active steps can help to keep boat batteries charged:

Battery Storing Tips:

  1. If you’re going to be storing your boat for a while, remove the battery from the boat and store it in a cool, dry place with plenty of ventilation.
  2. Don’t use old and new batteries together.
  3. Don’t mix batteries of different types.
  4. Keep your boat out of direct sunlight when not using or charging for long periods of time.

Tips for Battery Water:

  1. Make sure you use distilled water in your batteries – tap water can corrode metal parts over time.
  2. Check and maintain your water levels every few weeks by adding distilled water if necessary. If you don’t know how much water your batter needs then just measure from the top of the plates (there should be adequate markings available). It’s important because excessive heat with little moisture to absorb them will cause premature drying-out (corrosion) which can reduce short circuits.

Tips about Battery Charge:

  1. Don’t let a fully charged battery sit for more than 2 weeks without being used.
  2. Keep your boat batteries charged by checking them every month and topping off the charge if they need it.
  3. Never discharge a lead-acid battery below 50%. This won’t prolong its lifespan like keeping charge between 40% to 80% will do.
  4. AGM batteries need to be charged between 60 and 80% to maintain a long life.
  5. Gel cell boat batteries need to be recharged correctly or they will suffer permanent failure.
  6. To keep your battery at its optimum level, avoid high-voltage fast charging cycles and unplug the charge once it has reached full capacity.
  7. If you use a battery charger with an automatic shut-off, remember to turn it back on before you leave the boat unattended for any period of time.
  8. Let’s not forget the marine starting battery. This is a special deep-cycle type of lead-acid battery that can be charged at high voltage fast for short periods of time, but it must also be maintained with slower and lower voltages to keep its charge viable.
  9. Equalization (Only For Lead Acid Batteries) – equalization cleans your battery and can extend its lifespan. You need to make sure that you use a charger with equalization at least once or twice each year, ideally in spring before winterizing as well as fall just before using the boat again.
  10. Check your battery’s voltage to see if it is below 12 volts.
  11. If the battery is too low, charge it with a charger that matches the type of battery you have.
  12. Make sure you fully charge and then discharge the battery before recharging it again.

Tips for Battery Cleaning:

  1. Check connections between the cables and terminals- clean corrosion off as needed.
  2. Make sure vent caps are not clogged up with debris

When was the last time you tested your batteries?

In order to keep your boat batteries charged, it is important to test them regularly. It’s a good idea to do this every week and when you are using the motor for long periods of time or if your charging system isn’t working well.

The first step in how to get boat batteries charged is testing their voltage with a voltmeter. This will help determine how much charge they have left before needing recharging from solar panels or an alternator on shore power (shore power charger). If the battery has no more than 12 volts then that means it needs recharging as soon as possible!

How can I extend my battery’s life?

We all want our batteries to last as long as possible, but there are things you can do to make this happen. How you care for your battery will determine how long it lasts and what features it offers when the time comes. There are many tips on how to extend a boat battery’s life.

The average life of a boat battery is around 3-4 years, although they can last up to 6 years in the right conditions. To ensure your battery lasts its full lifespan, keep your batteries connected to a maintenance charger that will charge it and maintain it at all times. Avoid getting caught out on the water with no power by regularly testing or replacing them yearly for new ones!

Why has my battery failed?

Ever since your boat battery has been dying, you’ve probably wondered why. There are many reasons for this problem and one of the more common ones is that the rectifier isn’t working correctly. A lot like an alternator in a car, it helps charge up your batteries while running on its engine as well!


If you want to keep your boat batteries charged, use these tips. You can now get more power and longer life out of your battery by following a few simple rules. It’s easy to do and it will save you money in the long run! Here are some things that we recommend for keeping boat batteries charged:

*Don’t let them discharge too much before recharging – it may take less time to recharge after shorter periods of disuse than if they have been used extensively; *Make sure not to overload electrical systems when charging devices or running equipment on board so as not to overstress the system and cause premature damage; *If possible, store electronics off while not being used (preferably with their chargers unplugged) to avoid drain on the battery;*Avoid extreme temperature environments – excessive heat can cause batteries to overheat and freeze, resulting in permanent damage.


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