You want to do two things after you charge the battery. Check your voltmeter with the car running and check that it's reading ~14.5V. Then, go get a load test done on your battery. If this checks out ok, you have a current drain that needs correcting. Your battery shouldn't die after sitting for two months.
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"America.... still builds rockets!"
Vette: 355 cid, 400 rwhp
'13 CTS-V Coupe: 6.2L LSA, 556HP
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