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So car sat for a week. Wouldn't start. Put charger on for 90 minutes and it stsrted with no problem. Worked fine for three days. Sat for two days and won't start again. Charger is on it now.
How old is the battery?
If you don't know I would replace it and buy a battery maintainer and hook it up every time you park it for a few days.
It takes me about a minute to hook mine up and my battery is always charged.
Good luck!