GoPro Rechargeable Li-ion battery for GoPro Hero 1 & 2
Amazon.com : MaximalPower replacement Battery for GoPro AHDBT-001, AHDBT-002, GoPro Hero HD HERO and HERO2 Pro Camera 2 Pack : Digital Camera Batteries : Electronics
GOPRO Hero 2 AHDBT-001 LI-ION 1100mAh Video Battery + FREE SHIPPING - Brooklyn Battery Works