Be oneself 3.7V 500mAh Lithium Polymer mini rechargeable battery 472540 Li-ion Li-Po for #11&#18 keychain camera Lithium Polymer mini rechargeable battery Output Voltage:3.7V 500mAh 472540 Li-ion Li-Po #11&#18 keychain camera Battery Size: 40 mm x 25 mm x 4.9 mmPlug Pin / hole: 1.25mm-2P pitch