At present, my van has a group 78 battery (5.6 or something engine size, the big 350). Is the larger battery needed, or would a group 75 (less amps) work?
The Blazer has a group 75, the smaller battery (4.3 engine). Should it have the larger battery?
I'm in NY state, so we get down about 0F at the coldest part of winter.
The van battery was installed oct 07. The Blazer is undetermined, it was used when I got the truck last Jan. What's a typical battery life?