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If your battery is losing its charge overnight then you probably need a new battery. Running a vehicle with the positive cable disconnected can damage your alternator and is never recommended. Take it to an auto parts store, and they will run a charging system check, usually for free. AutoZone and Advanced Auto Parts do this for sure.
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you should check your battery cables & see if they need to be cleaned
have your battery check to see if it's still good
if these other 's aren't the problem then have your alternator checked
Why is my jeep battery losing its charge overnight?