crimson eagle
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In Northern California where I am, it can get to 110 ambient temp in the summer, the cells don't appreciate this. My method for using cells will be to buy at the start of the winter/Indoor season. And use temp charging to 115 or 120. In the summer I'll peak charge probably with a low delta, knowing my cells will be trashed by the time the winter season starts, then buy more.
Chris you are right on , ambient temp vs battery temp is very critical