At first, my battery tended to be dead when it was in the 40-50 degree range in the morning. I've put the car on a 2-amp charge for 10+ hours and that seems to solve it for 10+ days, then it just doesn't have the juice to crank over. The car is completely unmodified, but nearly 4 years old. Oh, the battery did have several cells that were down 1+ inches, but the problem was not solved when I refilled and put it on a long, low charge.
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You probably have an electrical drain on your battery. Check an see if your light in your trunk stays on all the time. I had this problem before but mine would go dead after 8 hours or so. I could not figure out were my drain was so I installed a sylinoid to cut off all power coming from the battery with a switch I installed inside the car. A quick way to tell if it is an electrical drain is disconnect the battery when you park the car, than re attatch the battery cables next time. If it starts no problem it's a drain somewhere. If not it might be that your alternator is going bad or even possibly your belt going to your alternator is slipping. Hope this helps
Have your alternator checked and at the same time have the battery checked at your local Auto Zone or O'Reilly auto parts store. Or auto parts store similar to one of those. Sometimes when your battery goes dead it tends to wreak havoc on the alternator which can cause the battery to not hold its charge.
There is probably a weak diode in the alternator; this will cause the battery to drain slowly and will often not turn on the indicator on the dashboard.
If you want to get your hands dirty, remove the negative battery cable first (always!)
Remove the heavy lead from the alternator terminal that goes to the positive terminal of the battery.
Reconnect the negative battery terminal.
If the car starts mornings, a bad alternator is pretty much confirmed but you can't drive real far with no alternator to charge the battery.
Any chain auto parts store will test your alternator free but I don't know if that is in or out of the car.
BTW, you can buy a digital meter for under $20 many places today and most will have a 10 ampere range that will allow you to check for a current drain of the kind you now have which is probably under the 10 amps.
One final item; recently the courtesy light switch on the passenger side rear door of my wife's Jeep recently decided to not quite reach anymore and the battery was drained twice before I noticed that 'door ajar' light was telling us that in advance. Even an amp or two will drag a battery down given time.
obviously there is an abnormal drain on the vehicles electrical system. Examples of this are a glove box or conso;e light staying even though you closed it, is there a reading or compartment light on ? Anybody that just says "you need a battery without ALSO testing the electrical system for integrity is not helping,
It Must Be THAWED Out Literaly Sounds Wild But I Towed for Years Here in INDIANA And I towed them to shop Put them inside for an Hour or so with Salamander Heaters Blasting at them and that WORKED. I Hope this helps you and you have a Better DAY!!!!!!!!!!! Please dont forget to Rate Me