Stay off the beaten track for longer with the external power pack by powermonkey-eXplorer. Designed specifically for our fitness and outdoor devices, this water-resistant power pack houses a 2200 mAh lithium-ion battery capable of recharging 5 V devices while remaining robust, compact and lightweight enough for space and weight-conscious outdoor enthusiasts. Suitable for even the most demanding riders, the external power pack provides real power when you need it most . Recharge the pack 3 ways. Use the included folding solar panel, which allows the external power pack to be recharged to 1/3 power in 5 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 7 hours. For use with the following models: Forerunner 110 Forerunner 210 Forerunner 610 Forerunner 910 Edge 500 Edge 510 Edge 800 Edge 810