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When I washed my 03 C4S the other day I accidently left the key in the accessory oposition overnight
Needless to say the car was dead, I mean D E A D the next day. The battery is less than a year old. Will I be able to charge it back up or is it ruined?
Thanks
It will probably come back to life, but sometimes when your REALLY kill them the plates can warp and they won't come back....however I'll bet that because it's relatively new, it will charge up and hold the charge. You'll know in a hurry....it will sit there and just heat up but won't hold the charge when you put the charger on it. You might also want to take it to Autozone when you get it charged and have test it for you....with winter coming, this is the time batteries start dying if they're prone to croak...the first cold snap usually does in the ones that are on the cusp.
The last time my battery died I called AAA to come out and jump the car. It was DEAD! If the car is really dead, note that there are two places to attach batteries onto to jump the car. There is the ususal connection directly to the battery and there are a set of connections directly on the engine. You will see a cap with a "+" sign on it for the postive terminal and the negative you can connect to the latch. Good luck!
Unfortunately, competely discharging a normal cycle battery will reduce its life. It will be OK because it is new, but you have reduced its total service life due to "sulfation" of the lead plates, which are thinner and less dense than in a deep cycle battery. Its not like we haven't all done this a zillion times, though.
I think it will come back with charging. You should not depend on a jump and letting the alternator charge up a dead battery, this will put undo strain on your alternator and may shorten its life considerably. You do know how much a new alternators costs? $900.00
Unless there is something wrong with the voltage regulator, I don't think this would constitute undue strain. But I agree it would be better to fully charge with a charger. You should buy one anyway if you don't have one. As well as a battery "tender". Neither really substitutes for the other.
I think the "extra" stress is minimal. An old Chevy 30 amp alternator can charge a battery just fine back from the dead, the 150 amp (?) 996 alternator wouldnt even break a sweat.
The last time I did that, it was on my airplane. Rather than just jumping it, I put a low amp charger on it for a few days so it brought the charge back gradually to full float charge. You probably need your car sooner than a few days....but that approach worked well. (Jumping & running may work equally well.)
I had a dead battery this past spring because I didn't use my battery tender over the winter, I thought it was toast. I put it on a slow charge overnight and have not had an issue since.Probably shortened its life some, but so far no issues.
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