batteries are a mystery sometimes. But, with that said, clean terminals, good connections, especially between the battery and alternator, are important. Not leaving things on like a gps, phone charger all night. Little things start to take their toll on batteries. My Varta I took out of the roadster in still on the shelf, I keep it charged and use it to jump start things, like the lawn mower. The other Varta I took out of the coupe is still powering a dump trailer a friend of mine has. I would buy another one of those batteries after my shurykins go dead...