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Originally Posted by HummerJim
Does the black quilted, blanket-like covering over and around the engine battery serve any purpose other than to look nice? I'm thinking of putting in an Optima Red Top Battery and the one they recommend for the Hummer H2 is too tall to close the top of the battery bag.
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Yes it does serve a purpose. It protects the battery from extreme heat and cold which may degrade your battery faster.
"One of the big mistakes that the do-it-yourself and professional mechanics will make is when they replace the battery they will discard this insulated cover.
This will also shorten the car battery life span. The manufacture put this insulated battery cover on for a reason so you don’t want to forget to reinstall it " - auto-facts.org