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Take the battery out of the car, bring it to a auto parts store or battery store and have it tested to see if it can take a charge. That should tell you whether you need to recharge or replace. There's no reason to replace a battery that just needed a charge.
Either way, if it's going to be sitting for a month or more, take it out of the car and put it on a battery tender. This will keep the battery from being ruined.
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