Could be true, on the other hand, in a hot weather climate you should be checking the fluid level and adding distilled water as needed.
I do notice that many cars come with a battery insulator that seems to often get tossed away with the old battery when replacement time comes. The underhood temperature has been going up with newer cars due to the tighter engine compartments, so the battery insulator becomes necessary to protect the battery from the heat.
My Saab has a duct that directs air from in front of the radiator to cool the battery which is under a cover.
I do notice that many cars come with a battery insulator that seems to often get tossed away with the old battery when replacement time comes. The underhood temperature has been going up with newer cars due to the tighter engine compartments, so the battery insulator becomes necessary to protect the battery from the heat.
My Saab has a duct that directs air from in front of the radiator to cool the battery which is under a cover.