MWA's New Trent s great and I use this one - Anker Astro
http://www.amazon.com/Anker-8400mAh-External-Flashlight-Smartphones/dp/B0067UPRQ4/ref=sr_1_4?s=electronics&ie=UTF8&qid=1335777680&sr=1-4&tag=e04ed-20
http://www.amazon.com/Anker-8400mAh-External-Flashlight-Smartphones/dp/B0067UPRQ4/ref=sr_1_4?s=electronics&ie=UTF8&qid=1335777680&sr=1-4&tag=e04ed-20