![]() You can find them online and in most auto-part stores. One of the easiest to use is an EZRED Battery Hydrometer. How to Use a Multimeter to Determine Battery Power In effect, when determining the remaining battery power of a lead-acid battery, you are trying to determine how close you are to 50% rather than 0%. It probably won’t hurt the battery too much if you used 60-70% of the battery capacity every once in a while, but doing so frequently will shorten the battery’s lifespan. In other words, your battery will last the longest when you don’t drain it below 50%. Regardless of the type of lead-acid battery you have, the recommended maximum depth of discharge is 50%. Depth of Discharge (DoD) of an RV Lead-Acid Battery If you don’t already know your battery type, this information should be on the battery label. 6V deep-cycle golf cart batteries (typically flooded type)īefore determining the charge state of your LA batteries, it is a good idea to know what kind of battery you have.12V sealed Absorbent Glass Mat (AGM) batteries.12V flooded lead-acid batteries (the kind you have to add water to). ![]() You’ll find three styles of deep-cycle lead-acid batteries in the RV world: ![]() In contrast, deep-cycle batteries are designed to give a steady current or a long period to run your RV lights, furnace fan, etc. The difference is the starter battery for your engine is intended to deliver a lot of power very quickly to start your motor. Though your car or truck uses the same type of battery, your RV will most likely have deep-cycle 12V batteries. Lead-acid (LA) batteries are the most common type of battery you will find on an RV.
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