Product model: INR21700-4000mAh (DOS) Nominal capacity: 4000mAh Nominal voltage: 3.7V Cycle life: 0.5C charge 1.5C discharge 300cycles≥80% Maximum support discharge current: 1.5C Internal resistance: ≤40mΩ Diameter: 21.7mm Height: 70.3mm Weight: 67.8±1g Optional range of cap models: simple explosion-proof caps, power CID caps