Almost all of our heavy equipment has several batteries each. We only replace the bad ones. The other OEM battery checks out ok with our load tester. Just wandered if it was really mandetory to relace both or is it one of those warm & fuzzy feeling thingys? It really cranks faster with the new Duralast Gold battery. Probably will go with another new battery so I won't be worried about it!
Due to battery companies changing the CCA rates from year to year it could be hard to match an old battery to a new one unless the battery is fairly new. I was always told to keep the battery CCA the same. If they vary much you could over charge a lower rated battery in order to get the higher rated battery to be fully charged. Most of the time the "good" battery will croak soon after the first one.
In a parralell battery system,just replacing one shouldn't hurt.But,as suggested,keep the batterys the same size and idealy the same brand.This keeps the charge rates the same.Never mix battery 'types'.ie:never try to match a flooded lead-acid with an agm for example.The charge rates are so dissimilar that one will quikly fry.
I had a battery replaced well out of warranty because of it leaking acid from the positive terminal. There is a class action law suit against Delco for this issue. I took it to my stealer and said "I see acid leaking from the + terminal. I think there is some kind of class action law suit on this, however I wanted to give you the chance to fix this b4 I hop on that bandwagon." I found out about this lawsuit on yahoo.
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