Power On Demand: Fenix ARB-L18-3500U USB Rechargeable Li-ion 18650 Battery

When your high-drain gear demands stamina, this 3,500 mAh 18650 battery shows up with the confidence of a well-packed trail snack. It powers your brightest flashlights, headlamps, and lanterns without whining at 60% charge.

AXG Life meets Life, Adventure-Ready power you can trust on every expedition. Built for the long haul, this cell turns rugged nights into stories you’ll actually tell around the campfire.

Key Features & Design

• Capacity and voltage: 3,500 mAh at 3.6 V
• Size and form: standard 18650 cell — about 69 mm long and 18.6 mm in diameter; weight around 50 g
• Design: Button-top design compatible with Fenix and other 18650 devices; USB recharge-ready
• Protection and safety: Integrated protection against overcharge, over-discharge, short-circuit, and overheating; pressure relief vents; reinforced steel-infused anode for improved impact resistance and electrical safety
• Durability and life: Up to 500 charge cycles, retaining roughly 75% of capacity over time; comes with a 12-month warranty
• Compatibility and packaging: Suitable for tactical flashlights, headlamps, lanterns, and other high-drain devices; packaged as one battery
• Shipping note: Lithium-ion batteries are considered dangerous goods and typically ship by ground; orders containing loose batteries may take longer to deliver (delivery times of 14+ days aren’t uncommon)

Performance / Benefits

Power delivery that keeps pace with your adventures. The ARB-L18-3500U provides reliable, high-drain energy for high-performance gear, so you’re less likely to stall out when the trail goes dark. Safety features minimize risk during charging and use, while pressure relief vents help prevent swelling or ruptures in tough environments. The reinforced steel-infused anode adds durability for rugged hands and accidental drops, making it a solid companion for everything from tactical flashlights to lanterns. With up to 500 charge cycles and about 75% capacity retained over time, you’ll get a lot of life per coin, which is exactly how AXG likes to roll—turning midnight trail runs and questionable decisions into actual memories.

Closing CTA

Ready to power your next adventure? Add this to your cart and outpace the sunset—your gear deserves a battery as bold as your plans.