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      07-21-2020, 04:52 AM   #28
Biginboca
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Drives: 2009 E92 328i 6MT
Join Date: Jun 2017
Location: Boynton Beach, FL... USA

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Quote:
Originally Posted by Steve Sas View Post
The Ah rating for LifePo4 is different to lead acid. I think lithium can discharge lower than lead acid before engine will not start.
I've got a lithium 12.8v battery with 42ah and supplies 900cca. You notice the engine kicking over faster with the lithium battery.

Best to find out what cells are being used in the battery you are buying.

https://www.aliexpress.com/item/3300...37254c4dEZQcjD

This battery uses A123 system cells. AHP14M1Ultra-A 14ah cells in 4S3P configuration.

Note battery listed is not 60ah for $1000. China likes to make up there own specs and unrealistic pricing. I paid $440 AUD for battery with 10a matching charger.

And be careful if you overcharge battery in car, over voltage protect will kick in and disconnect battery from car while it is still running.
Antigravity specs the 30ah battery I bought at 1200cca, while the 60ah agm diehard gold I used to have was spec’ed around 850cca
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