How long can a battery possibly last

8 years seems common to me on a high end, high capacity batteries; I get that regularly on batteries in my diesel trucks which pull some charge when starting. My '09 Challenger battery just got replaced..... 2 months past the 10 year anniversary. The one in my '62 Dart is at least that old. No special chargers or anything else except for regular use.

It's all in buying the more expensive, and heavier batteries.