Brief descrption: My parents were looking at X5's and I helped them out with some research and came across this forum, anyway, I went with my parents yesterday to buy their E70 with comfort access, and during the walk-thru of the car, the saleman told them to put the key fob in the slot every now and then, that way it'll charge it up. Don't know if how true that is, but that's what he said.