Very important--make sure the area where the batteries are mounted in is clean--if you have acid drips it can result in shorting of the batteries and individual batteries will cause other batteries to go bad
When I served on an old diesel electric submarine, use to scrub batteries (keep the solution away from the battery fills) with a mixture of baking soda & pure water (distilled water)-- and make sure nothing goes into the batteries but distilled water(not purified or filtered water)--after scrubbing the batteries rinse them with"pure" water
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