Lithium-ion (Li-ion), 100V-240V (Input), 3.7V (Output), 0.35A(Output Current), 500mAh, Dark Blue, 1. This product package includes 1 charger and 2 pcs of RCR123A echargeable batteries. 2. Our rechargeable batteries must be charged with our charger included in the package - - do NOT use other chargers. 3. Do NOT use our charger for rechargeable and/or one-off batteries of other brands.