ON THE WAY&reg;10pcs 2000mah TCR 14500 3.7V AA Rechargeable Li-ion Battery with PCB Protected Board High energy density, long life battery.Warm tips:Before purchase, please make sure the battery voltage corresponds with your device voltage No memory effect and a longer storage life than NiMH Batteries. Lighter weight and higher energy density than any other rechargeable battery. Can use special PCB ( protection IC) to build 14500 battery pack. Fit for camera, MP3/MP4 Player, electronic toys and other electronic devices