Fenix 26650 is a rechargeable battery with a capacity of 4800 mAh. For comparison, this is about one third more capacity than a common smartphone battery. Fenix 26650 boasts overheating protection and a special explosion‑proof safety vent. In addition, it is equipped with protection against overcharging, deep discharge, and short circuit. It does not suffer from memory effect or self‑discharge.
You can use the battery, for example, in flashlights Fenix FD40 or Fenix PD40. It also offers very good service life. After 500 cycles it retains at least 70% of its original capacity.