ARB-L21-5000U is a high capacity 21700 Li-ion USB  rechargeable
battery built for more power and longer runtimes.
This battery has its own USB-C charging port for quick/easy charging
without the need for a separate charger.
Additional features include a protection circuit in the  anode  to  help
prevent short circuits, over charge/discharge and over heating.
Pressure relief vents  which  expel  waste  gas  in  the  rare  case  of
an internal short circuit preventing an explosion.
 
Features
- Battery capacity up to 5000mAh.
- 
500 charging cycles.
- 
Protection circuitry to prevent short circuits.
- This product will  only work in those models supporting
 21700 batteries.
- A USB-C charging cord is  NOT included.
- 
Pressure  vents  to  prevent explosions.
- 
Indicator  light  on  battery  is  red while it is charging, 
 blue when charged
 
Specifications:
- 
Capacity: 5000mAh
- 
Voltage: 3.6V
- 
Charging Current:
 Recommended: 1A,
 Maximum: 5A
- 
Weight: 72.5g
- 
Size:
 Length: 76mm
 Diameter: 21.5mm
 
Compatible with: E35 V3.0, HT18, LR35R,  LR50R,  PD36R,
PD36 TAC, PD40R V2.0, Tk16 V2.0, TK20R V2.0, TK22 V2.0,
TK22 UE, and TK30.
Important  Note:  
This  battery  is  NOT  COMPATIBLE  with 18650 flashlight  or
older style chargers. COMPATIBLE chargers are the  ARE-A2,
ARE-A4, ARE-D1 OR ARE-D2.