GeB Li-Ion Battery 21700 4000mAh 3.7V

Product detailed description

Original rechargeable lithium-ion cell GeB 21700-4000 is a quality choice with a balanced ratio of capacity and performance. It offers a capacity of 4000 mAh and can handle a maximum continuous discharge current of up to 12 A, making it suitable for more demanding applications. The cell does not have built-in protection, so we recommend using a TP4056 Li-ion cell charger with protection, which ensures safe operation. Batteries are supplied partially charged (approx. 60–80%), which is ideal for storage; we recommend a full charge before use.

Specifications:

• Manufacturer: GeB
• Type: Li-ion 21700
• Capacity: 4000mAh (measured at 0.2C)
• Protection circuit: NO
• Nominal Voltage: 3.7V
• Charging Voltage: 4.2V
• Standard charging current: 0.8A (0.2C)
• Max. charging current: 2A (0.5C)
• Max. discharge current: 12A (3C)
• Do not discharge below: 2.75V
• Charging End: 65mA
• Dimensions: 71.5 x 22 mm ±0.2mm
• Weight: 69g
• Operating Temperature (Discharge): −20 to 60°C
• At temperatures below 10 °C, use a charging current of maximum 0.25 C.

Package contents:

• 1× GeB Li-Ion Battery 21700 4000mAh 3.7V

Important Notice and Safety:

• The user bears full responsibility for correct use, charging, and installation. Improper handling may cause fire, injury, or property damage.
• Charge exclusively with a charger designed for Li-Ion / Li-Pol cells (CC/CV mode 4.2 V).
• Do not use NiMH/NiCd chargers.
• Recommended charging is 0.2C or lower for maximum lifespan.
• Never short-circuit, puncture, crush, or mechanically damage the battery.
• Do not charge or use the battery unattended.
• Do not expose to high temperatures, direct sunlight, or fire.
• Protect from water and moisture.
• If any swelling, odor, overheating, or change in shape occurs, stop using the battery immediately.
• When disposing, always insulate the contacts against short circuits.

Notes:

• This product is not a standalone functional unit and may require professional installation.
• Product images are for illustrative purposes only and may sometimes differ from the actual appearance of the item. However, this does not change their basic properties.