a recon battery will get you by for a bit but is in no way to be considered anything close to a new battery. They check cells, replace any that are considered unsatisfactory but in the end you have a used battery and it's a 50/50 chance it will last any decent amount of time before the other cells start giving trouble. The recon warranty usually isn't very long either. It's one of those pay me now or pay me later kinda things.
Up to you (or your customer) how to proceed.
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