Quote:
Originally Posted by jparnes1
It's always helpful to check your battery with a voltmeter if you suspect it's the source of the problem. Check it in the morning after it's been fully discharged overnight. You don't want to read much below 12 V. However if all you do are short trips you're not giving the alternator enough time to recharge the battery. In that case you'll show low voltage even though your battery is still good.
You can also do a load test by having a helper start the car while you look at the meter. The battery shouldn't drop more than 2V before the engine turns over.
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I started having issues when I left an old iPhone 4 in the connected drive console. I only had the phone in there for the music, but for some reason having a phone in there keeps the system from going to sleep, and my battery would be dead in just a couple of days. I don't leave the phone in there any more. As a matter of fact, I don't even leave the snap in adapter as it seems to cause an issue as well.