![]() 050 or more difference in the specific gravity reading between the highest and lowest cell, you may have a weak or dead battery cell. All the cells should read about the same.Continue onto the next cell and repeat until you have measured all the battery cells.Read the measured value on the device and write that value down.Release the bulb to draw fluid into the hydrometer until the battery electrolyte solution fills the hydrometer to the maximum level. Squeeze the bulb and carefully insert the battery hydrometer into the cell.Safety first! Battery acid is very harmful to your skin.The nice thing about the EZRED hydrometer is it’s a temperature compensating hydrometer. 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. ![]()
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