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4PC mAh BRC 3.7v Li-ion Battery + 2X Smart Battery Charger.

Product – 2 PCS mAh BRC 3.7v Li-ion Battery + DUAL Charger UB.

https://rechargebatterygo.com/6000mah

10pcs Black 3.7V mAh Li-ion Battery USA Stock. $9.76 Buy It Now 13d 4h. See Details. 10PCS mah 3.7v Li-ion Battery For Torch.

https://en.wikipedia.org/wiki/Rechargeable_battery

https://en.wikipedia.org/wiki/Rechargeable_alkaline_battery

Amazon.com: 18650 rechargeable flashlight

rechargeable flashlight 18650 | eBay