UltraFire BRC 18650 4200mAh battery 3.7V with button top
Hight Quality UltraFire BRC 18650 Lithium Batteries 4200mAh 3.7V 2A Rechargeable Battery Red Li Ion Bateria Suitable For Electronic LED Flashlight Digital Camera From Horizonoutlet, $0.97 | DHgate.Com
2-20 PCS 18650 Battery 3.7V 4200mAh Rechargeable Liion Battery for Led Flashlight Torch Batery Litio Battery - AliExpress