I also have not had battery issues, but my X150 is my primary get-me-around.

 

The only Battery Problem I experienced was before I replaced the original one a couple years ago... I had left the doors open with the radio on while I washed the interior. THAT was dumb. I pushed it back into the garage and charged the battery, but it never started the car again. So a new battery... and since I drive only occasionally during winter months, I figured Be Safe so I got a maintainer. Zero problems since, but then again I never leave doors open or the radio on now.