18650 battery: 18mm diameter, 65mm length, 3500mAh capacity (about 12.95Wh), weight about 51.5g. 21700 battery: 21mm diameter, 70mm length, 5000mAh capacity (about 18.5Wh), weight about 70.3g. 21700 capacity about 1.43 times 18650.
18650 suitable for: Power banks, power tools, high-power flashlights, robot vacuums, vacuum cleaners, electric scooters, drones, solar lights, laptops, portable power stations, medical devices.
21700 suitable for: E-bikes, electric motorcycles, portable power stations, power tools, high-power flashlights, vacuum cleaners, drones, scooters, car jump starters, solar energy storage. 21700 more suitable for high-capacity, high-power scenarios.
Our technical team can provide professional battery selection solutions and OEM/ODM customization services based on your device requirements.
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