Well, my one doesn't....lasted just over a year then died when it realised it was a month past warranty :lol:

I just went and got a Halfrauds special battery charger. It's about the size of a small shed and I just cut the old optimate lead off and used it to make a cable for the halfords jobbie.

I don't bother to leave it permanently connected now, just leave it on overnight every couple of weeks.