Re: Practically dead battery in the Accord this morning :(
Yup. I'm in total agreement. However, I think the battery could handle more than we can. Most of the electronics I know of can handle 100F. I suspect It should be able to handle a little more because the inside of a car parked in the summer can get to 115 in chicago, and I won't even try to guess in Phoenix. Manufacturers must have taken that into account.
I do think keeping it cooler will extend its life though.
In my case temps >100 are rare (maybe 4 or 5 times a year) so I'm not too worried.