So in the last 3 months or so I have went to start my car and it tries to turn over and tries and tries and gives up .. Noticed the voltage was like between 11.9 and 12.2 I just it off and it cranks right up runs smooth and no problems .. Only does it of the car sits for like a few days with no movement ... Car usually will not start until the voltage gets up to about 13 something ... Went to autozone this am after this happened and they tested the battery and the alternator both where fine they say .. Thou I'm sure the battery was fine after I jumped it off and drive 20 min to them ... So in your opinions what's going on here ??? Options ???