Everyone knows that cold weather is hard on a battery. But did you know that high heat is just as bad? That’s why most late-model cars come equipped with a battery insulating jacket. The jacket helps the battery retain heat in the winter and repel engine compartment heat in the summer. Removing the battery insulating jacket can shorten the life of the battery by almost two-thirds, especially if you live in a hot climate. Always reinstall the battery insulating jacket when changing the battery. If you’ve installed a larger battery and the jacket doesn’t fit, replace it with one sized to fit snugly around the battery. If your vehicle battery didn’t come with a jacket, check with your auto parts store to see if one can be added.