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How to properly maintain flooded lead acid batteries for long life. My first battery bank is about 4.5 years old and going on strong, it has about 100 cycles at no more than 50% discharge. The second battery bank is a bit over 3 years old and has about 50 discharge cycles also. Both are going strong because I have ensured that the plates are always covered with distilled water and thus ensure battery life. The other piece of advice is to run an equalize charge (sometimes referred as absorb) at least quarterly but monthly is preferred. And lastly, you will want to remove all the cables and clean the terminals and cables and use corrosion preventative compound on them to avoid corrosion.