Quote:
Originally Posted by cs123
I don’t know. You tell me. They do state that the alternator is only for maintenance charging and not to charge a flat battery with the alternator
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Its because their charge rate effectively halves at over 60 degrees C and above 80 degrees it barely charges at all.
Doesn't take much to get to 80 degrees C ambient temperature in an engine bay and the battery won't be too far behind those temperatures.
If they made that public knowledge on their website you probably wouldn't buy one and put it in your engine bay.
REDARC has some information on this - not specifically pointing to the Optima but talking about 'some' AGM batteries and heat:
https://www.redarc.com.au/blog/how-t...20their%20life
OEM either insulate AGM batteries mounted in engine bays or they're just not put in engine bays, check out the case on AGM batteries advertised as under bonnet safe and check warranties.