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It doesn't take much to kill a battery in 3-5 days. There are parasitic draws from your ECM, which combined with stereo memory, alarms, etc can add up to be a decent enough draw to kill a battery. And a battery will never charge back to 100%. Each drain takes a little more life out of that battery. If you have a DVOM, you can check for parastic draws by disconnecting your negative cable and setting the DVOM to DC amps and put the leads in series between the negative terminal and cable. See what your draw is and disconnect fuses until the draw is 0 and then you will know which circuit the draw is on. It may be on 2-3 different circuits. If there are things on those circuits that you don't or can't turn off, they make solar battery charger/tenders that plug into your cigarette lighter that will maintain your battery. Or you can run the car a little more often. Hope that helps
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