Rechargeable 18650 Li-ion Battery No name ARB-L18U 4000 mAh 3.6V (USB rechargeable)

The Rechargeable 18650 Li-ion Battery No name ARB-L18U 4000 mAh 3.6V is a single-cell lithium-ion power source designed for devices that accept standard 18650 cells. This model integrates a USB charging port directly on the cell, allowing recharging without a separate external charger. It delivers a nominal voltage of 3.6 V and a rated capacity of 4000 mAh, and includes built-in protection circuitry to help prevent overcharge, over-discharge and short circuit conditions during normal use.

Advantages

The integrated USB interface simplifies recharging by enabling connection to common USB power sources such as power adapters, power banks or computer USB ports. A high nominal capacity provides extended runtime compared with lower-capacity 18650 cells, while the built-in protection increases operational safety for portable electronics. The cell’s standard 18650 form factor ensures compatibility with a wide range of flashlights, power banks and electronic devices that accept this size.

Suitable for

• High-drain and medium-drain flashlights and torches
• Portable power banks and DIY battery packs
• Electronic devices and gadgets designed for 18650 cells (fans, radios, LED lights)
• Portable chargers and USB-rechargeable equipment

Key specifications

• Chemistry: Lithium-ion (Li-ion)
• Cell size: 18650 (standard cylindrical cell)
• Nominal voltage: 3.6 V
• Rated capacity: 4000 mAh
• Integrated charging: USB port built into the cell for direct charging
• Protection: Built-in protection circuitry for overcharge, over-discharge and short circuit
• Rechargeable: Yes, rechargeable via USB

How to use

Insert the battery into the device observing correct polarity marked on the device and cell. To recharge the cell, connect a suitable USB cable to the integrated USB port and plug the other end into a USB power source rated for standard USB output (5 V). Monitor charging and avoid leaving the battery connected to power indefinitely once charge is complete. Use only within the manufacturer’s recommended operating temperature range and in devices compatible with 18650 cells and the cell’s protection features.

Usage recommendations

Charge with a reliable USB power source and use a cable in good condition. Do not expose the battery to extreme heat, flames or water. Store at moderate temperature and partial state of charge for long-term storage. Replace the cell if it shows signs of damage, swelling, persistent overheating or reduced performance. For devices requiring balanced charging or specific charging protocols, use an appropriate external charger instead of relying solely on the integrated USB interface.