Yes, heat and vibration among a hand full of different factors..

All of the batteries I get are Designed for the Constant heat of the South.. So the Tag would be 78S.... As well in the North where there is a lot of cold you'd see a 78N....

I have several Everstart Maxx batteries in my cars... Brad also has one in the SSEi iirc( it still works ... lol )

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