21700 Flashlight Batteries

21700 flashlight cells are high-capacity rechargeable batteries for the high-output lights that have moved to the larger 21700 size.

Flashlight makers favor the 21700 because it holds more than an 18650 — more capacity means longer runtime and enough headroom to push serious brightness. The thing to get right when buying for a light is fitment: many flashlights require a button-top cell to make contact, and a protected cell adds an everyday safety margin. Some 21700 flashlight cells also build in USB-C charging, so you can recharge without a separate charger.

Buying for a specific light? Confirm whether it needs a button top or flat top, and whether it expects a protected cell, before ordering — that's what guarantees the cell both fits and performs in your flashlight.

Why it's the right pick

• High capacity for long runtime and bright output
• Protected and button-top options for fitment
• Select cells with onboard USB-C charging
• Built for modern high-output flashlights

Built for

• High-lumen and performance flashlights
• EDC and everyday carry lights
• Work, search, and outdoor lighting
• Any 21700-compatible torch