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Originally Posted by redpoint5
Curious how certain you are that it was the cabin heaters coming on, as I have not heard this mentioned before, and that's kind of a big deal.
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100% certain. Cabin Heat and Battery Heat are two different PIDs and I monitor both.
Update on the battery.
It is a 140R / H4 group AGM battery that is hard to find and expensive. I finally found one at O'Reilly's for $250. Costco, Interstate Batteries, NAPA, Auto Zone, and Advanced Auto did not have one in stock or don't even stock it at all. My local Chevy dealership had 3 in stock - for $335 each.
The Chevy Volt's larger H5 AGM battery is $185 but it would have taken a lot of work to make it fit under the hood of the Bolt.