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Old 12-09-2009, 11:42 AM   #41
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Quote:
Originally Posted by flipt86 View Post
I have had several red tops and I can never, and I mean never, get them to recharge and last after they drain once... If I have them go down, it's usually just time to trade them in.
Damn it, I let my Optima red top drain (I think). I need to get it on a charger ASAP. Hopefully Auto Zone will be good about letting me return it if it is dead.
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Old 12-09-2009, 01:58 PM   #42
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Originally Posted by flipt86 View Post
I have had several red tops and I can never, and I mean never, get them to recharge and last after they drain once...
Aren't most AGM batteries like that? IIRC you should never let such AGM fully drain.



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Old 12-09-2009, 07:24 PM   #43
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Yep, bad idea for I believe just about any lead-acid battery, AGM or not. AGM does not change the chemistry, it just improves the performance. The fact I did it at all is stupid; I don't mean to imply that I should have not done it since I have an Optima.
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Old 12-10-2009, 02:28 PM   #44
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The original Miata AGM batteries could sit dead for quite some time and be brought back to life with a trickle charge over night. Did it many times on both my NAs as I stored the cars for 4-5 months and was too lazy to disconnect them.

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