I've had my TT One XL Europe for about 18mths. and the battery is now next to useless. I've seldom used it without being plugged in and don't need need to use it outside the car but it now loses it's charge if not used for a few days . . This is really frustrating, you plug it in, switch on and it won't boot up, I assume it has lost it's memory, so you have to reset and wait for it to recharge before using .. oh: I Googled this problem and there are several forums discussing it, you can either send it back to TT for a new battery or buy one on-line. TomTom One XL Battery Replacement 1150mAh, PDA Batteries Has anyone else experienced this problem or attempted to change the TT battery ?