[farming pharmer]

My Jeep battery lasted 11 years. My Savana battery lasted 11 years also. In Michigan. These cars were daily drivers, and I think that makes all the difference in the world. My boat batteries (27 series x 3), 5 - 7 years MAX.

[RckyRaCoCo]

Put one of these on Grandma's car(driven very little)years ago here in MI because the car would sit for days in a cold garage and battery would eventually croak...

Saved her MANY AAA calls, not to mention batteries(the one in her car has to be more than 10 years old)

BTW, I've got a Savana that turned into a rust-bucket WAY before it's time. Of course I too didn't drive it much, but it spent a lot of time in storage...still rusted out(frame/brake-fuel lines, etc), oh, unfortunately the above product did not work on this vehicle, ...it required too many CCA's not saved before the battery buddy kicked in(or off as is the case)...not to mention a lot of ground connections(because of the rust)probably contributed to battery/charging issues with it.