ON The WAY2Pcs 2000mAh TCR 14500 3.7V Rechargeable Li-ion Battery and Battery Case Lighter weight and higher energy density than any other rechargeable battery. No memory effect and a longer storage life than NiMH Batteries. Holds 85% of it's charge over 12month period. Warm tips:Before purchase, please make sure the battery voltage corresponds with your device voltage 14500 3.7V Rechargeable Li-Ion battery with IC Protection. Fit for camera, MP3/MP4 Player, electronic toys and other electronic devices