Battery available from Battery.net approx $15.00. Unscrew metal threads and split case. Unplug battery remove and reglue the replacement battary back in as it was fitted by Garmin. Great unit and mine is on of the first as well. Now leave and use it on my Burgman 650 Maxi Schooter. Just purchased a Garmin 2460LT ($320 Aus) and I think this is better than the Quest was in it's day but not as clear in daylight conditions as the Quest. To easy. Regards Ross