The Weltool UB21-50 is a 21700 Li-ion rechargeable battery with a 5000mAh capacity suitable for high performance devices. This battery has USB-C charging port for fast charging and battery indicator lets you know when charging is complete. The UB21-50 also features a range of safety features to ensure safe usage and charging.

Specifications:

• Battery Size: 21700
• Battery Chemistry: Lithium Ion (Li-Ion)
• Capacity: 5000mAh
• Voltage: 3.6V
• Continuous discharge current: 14.5A（10-25 ℃）
• Charging current: 2A (Type-C USB interface charging current), 3.4A (Max. charger charging current)
• Overcharge protection voltage: 4.25±0.05V
• Over-discharge protection voltage: 2.5±0.1V
• Cycle charge and discharge times: After 300 times, the battery has 80% capacity
• Charging temperature: 0-45 ℃
• Discharge temperature: -20-55℃
• Storage temperature: -20-55℃
• Dimensions:
  • Length - 76±0.2 mm
  • Diameter - 21.4±0.2 mm
• Weight: 73±0.5g