Fenix 18650, 3500 mah USB Rechargable Battery

The Fenix 18650 3500 mAh (ARB-L18-3500U) rechargeable Li-ion cell blends high capacity with charging flexibility: use the integrated micro-USB port (e.g., from a PC or phone adapter) or a regular 18650 charger. Li-ion chemistry offers no memory effect, very low self-discharge, and the 18650 size delivers an excellent energy-to-size/weight ratio—perfect for powerful flashlights, headlamps, and bike lights. Dimensionally, it replaces two CR123A cells (always check your device compatibility).

Safety is top-tier with combined electronic and mechanical protections: over-charge, over-discharge, short-circuit, over-current, plus PTC thermal protection, internal separator, and a pressure-relief (anti-explosion) valve. Charging indicator: red while charging, blue/green when full.

Key features

• Capacity: 3500 mAh | Voltage: 3.6 V

• Max discharge: 2C (7 A) | Max external charge current: 2 A

• Micro-USB input charge current: 0.8 A

• Size: ⌀ 18.6 × 70 mm (±0.5 mm) | Weight: 50.2 g

• Cycle life: > 500 cycles

• Operating temps: charge 0–45 °C | discharge −20 to +60 °C

• In the box: 1× Fenix 18650 3500 mAh (USB). USB cable not included.