Rechargeable USB battery 18650 3500 mAh (Li-ion)

Fenix 18650 3500 mAh rechargeable battery (L18-3500U) with its own micro-USB charging connector.

It can be charged by connecting the cable to the micro-USB connector (e.g. from a computer or mobile phone charger) or in a conventional charger. Li-ion rechargeable batteries are characterized by very high capacity, do not suffer from memory effect or self-discharge. Li-ion in the 18650 size are the best choice in terms of stored energy due to the size and weight of the battery.

Fenix battery protection consists of internal safety mechanisms and protective electronics. Added electronic circuits prevent the cell from overcharging, over-discharging and against short circuit or too high current draw. If the battery electronics assess that the limits have been reached, they safely disconnect the cell.

Internal protection consists of a separator, PTC thermal protection and a special pressure relief valve. In the event that the gas pressure in the cell exceeds a certain limit, the internal electronics separates the electrodes inside the battery and thus de-facto interrupts the exothermic reaction and the pressure relief valve releases the excess gas pressure outside the battery.

The combination of electronic and mechanical (temperature and pressure) protection makes Fenix batteries one of the safest Li-ion batteries available.

The 18650 battery is roughly equivalent in size to two CR123A lithium batteries, which is why it is often used in flashlights as a rechargeable alternative to these primary cells. Please check first whether your device supports this battery.

Caution, due to its 70mm length and diameter it may not fit some devices.

PARAMETERS

• Nominal voltage : 3.6V
• Capacity : 3500 mAh, tested at 0.2C discharge current with termination at 2.5V and 25°C
• Maximum current draw : 2C (7 A)
• Maximum charging current : 2A, charging current of built-in micro-USB input : 0.8A.
• Dimensions: 18.6 mm (diameter) x 70 mm (length) (+/- 0.5 mm)
• Weight 50.2 g
• Protection against overcharging, full discharge and short circuit (>7A).
• Lifetime of more than 500 charging cycles
• Recommended operating temperatures: 0-45°C (charging), -20 to +60°C (discharging)
• USB cable is not included, but can be ordered separately from us see Related products

Charging via micro-USB connector

Plug the USB cable into the side micro-USB connector, during charging the indicator light on the top of the battery is red. When the battery is fully charged, it lights blue.

NOTICE

• Do not discharge the battery below 3V if possible
• Do not short-circuit the battery (do not connect the cell poles with a wire)
• Do not throw the battery into fire or water
• Never insert the battery into the charger in reverse (opposite polarities)
• When using the battery, observe safety principles
• Use only an adequate charger that supports Li-ion batteries