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21700 battery
21700: 3.6 V rechargeable lithium-ion cell, 21 mm × 70 mm, about 4,500 mAh (16.2 Wh). Same battery: INR21700.
3.6 Vvoltage
21 mmdiameter, 0.83 in
70 mmlong, 2.76 in
≈ 4,500 mAhcapacity
21700: what to know
- The number is the size: 21 mm in diameter and 70.0 mm long. It holds about 50% more than an 18650 and does not fit 18650 tubes.
21700 equivalents
INR21700
What uses a 21700 battery?
- High-power flashlights
- E-bike packs and power tools (as cells inside)
- Vape mods