ON THE WAY&reg;6x Button Top AA Size 2000mAh TCR 14500 3.7V Rechargeable Lithium-ion Battery for Flashlight Headlight+Touch Pen ON THE WAY6 Pcs 3.7V 14500 Li-Ion rechargeable batteries 2000mah, come with touch pen as a gift Provides excellent continuous power sources to your device It is perfect for building battery packs for RC robots, RC aircraft, RC cars, and building 14500 battery pack. Lighter weight and higher energy density than any other rechargeable battery Can use special PCB ( protection IC) to build 14500 battery pack