Wont hold a battery

Well you may want to check and see if your alternator is working, which is simple take your car to a local autozone or any major auto parts store and have them run a check on your alternator. chances are that is the problem. if not then they will be able to tell you what the problem is and where and how to fix it. but normally if the battery wont hold a charge while in operation then chances ar eits your battery itself or the alternator. but if you put a charge on the battery and jus let the vehicle set then you may a a draw somewhere in the electrical system. dont freak out though take it and have a free diagnostics check done and chances are they will be able to tell you what the problem is. good luck