Battery 21700 3.7v Original Tesla 21700 battery cell. For flashlights, power banks, led flashlights, headlights, electric bicycles, electric scooters, emergency power. Electric vehicle batteries. In the photo, the test on the aimax from 3.07v to 4.2v charge current 1a, showed a 5340mah capacity. I will ask questions. The battery without defects, bumps, smooth, not bent, did not sink, without scratches. At the moment, capacity / price and quality on the market are the best at the moment. Better than the 18650 battery. Battery voltage 3.7 Capacity 5000mah 5a / h Element size 21700 Cylinder size 21mm x 70mm Weight 69g Year 2019 end of September. Mileage 1800km Manufacturer 21700 Tesla-Panasonic. On charge, the aimax shows 5340. By mail or pickup.