Stay off the beaten track longer with Garmin's external power pack by powermonkey-eXplorer. Designed specifically for Garmin's fitness and outdoor devices, this water-resistant power pack houses a 2200 mAh lithium-ion battery capable of recharging 5-volt devices. It's robust, compact, and lightweight enough for space- and weight-conscious riders. The added 20 hours of extra ride time on the Edge 800 makes the combination ideal for everything from week-long touring trips to 24-hour marathon races. You can recharge the pack itself three separate ways: use the included folding solar panel, which allows the external power pack to be recharged to 1/3 power in five hours and full power within 15 hours; use the universal mains charger, which is compatible in more than 150 countries; or use the USB to recharge in less than seven hours.