Originally Posted by
ericjp
12.2 is too low. What was the voltage with it running? Should be around 14 volts.
While 12.2V is not fully charged it's not necessarily "too low" either. Depends on the state of charge when the battery was installed (new batteries in my experience are seldom fully charged), the temperature, and how long the engine was run to recharge from the several restarts he mentioned.
I'd agree though that he should check the voltage with the engine running to insure the alternator/charging system is working properly. If it is, and the car is driven sufficiently, then the battery voltage should get up into the high 12._s.
What's not good is to let a battery sit at less than 12.1 volts, which promotes sulfation, lowering the battery's capacity.
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