This insulator does two things: Obviously, it keeps the battery warmer
longer during cold weather. But much more importantly, it keeps the battery
cooler during hot weather.
Battery insulators are becoming more common on new cars. High underhood
temperatures and tightly sealed engine compartments have raised underhood
temperatures to Easy-Bake oven levels, well above the boiling point of water
in some spots in the engine bay. The insulator keeps the electrolyte cool
enough to not boil away. Remove it, and the battery rapidly runs out of
water. That's hard enough on a conventional battery that you can top off if
need be. It's doubly dreadful on maintenance-free batteries that do not have
Replace that insulator, and put in the correct battery. You may need to go
back to the dealer for the part.
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