Quote:
Originally Posted by Kanoe
I think it depends on the battery type to a point.
Anecdotally, I ran a spiral grid agm for 10 years and it always read low 12s after resting a few hours. I now have a regular agm and it’s higher but still 12.4 ish after resting. The flooded lead acids in my cars sit more at 12.6 to 12.8 as you would expect.
Not sure if there is any truth or logic to this, just my observations.
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I had megatron plus batteries sit at 13.1v in the summer and 12.5ish in the winter. I attribute that higher rest voltage to more calcium or whatever they add to the electrolyte to have the higher CCA in the winter.
According to the state of charge charts though I shouldn’t complain about 12.3v in the dead of winter. Even though this MTP-24F never passed the CCA test on my MidTronics battery tester as well as the MidTronics tester at Napa. But it passed the Load test twice on the 1000a load tester at the local interstate warehouse. I feel I should have it tested again.
I guess I’m still looking for an excuse to dump this battery because it ain’t close to the 800cca it’s rated at and I can tell the difference on a cold start. I really think I’ll replace it with a 27f when it’s time.
I wish a group 65 came in a F. I’d use that. They are 180RC which reflects a higher Ah rating over a 24 or 27.
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