ilauke Fast Lithium Battery Charger with 3.7V 2600mAh 18650 Li-ion IC Protected Rechargeable Batteries (2 Pack) Features 2-pack 2600mAh REAL CAPACITY rechargeable 18650 batteries for led flashlights,headlamp,etc Application Attentions: Battery powered for high-power LED flashlights, headlamps or laser pointers targeted at longer run time, but NOT applicable for Vaporizers or E-cig mods(Electronic cigarettes). Protective board integrated with IC protective board, avoid overcharge and discharge protection function Indicator light :Green (before charge)--red (charging)--Green (finish charge) Over voltage protection.Over current protection.Short circuit protection