A protected 21700 with a large capacity (5000mAh) and a JST connector
Keeppower 1S1P 21700 Li-Ion Battery PCB/BMS Protected with Wire Connector and JST

Seiko Protection/PCB with short circuit, overcharge and deep discharge protection. Removing the plug does not void the 2-year functional guarantee.
Cell Keeppower 21700 - 5000mAh
Protection PCB/BMS 3MOS with 15A fuse
Capacity 5000mAh
Minimum capacity 4900mAh
Rated voltage 3.6V - 3.7V
End-of-charge voltage 4.2V ± 0.05V
Final discharge voltage 2.50V
Connections JST connector (JST-SYP-2P)
Discharge current (constant) 3C = 15A
Chemistry LiCoO2 (ICR)
Protection circuit PCB 1950-3MOS
Charging method CC-CV
Diameter 21.60mm ± 0.25mm
Height 74.5mm ± 0.25mm
Weight 70g ± 1g
Data sheet BMS protection electronics PDF
Charging current normal/charging time 2500mA/3h
Fast charging current/charging time 4000mA/1.5h
Operating temperature charging 0 °C - 45 °C
Operating temperature discharging -20 °C - 60 °C
Safety note:

Please note that removing or damaging the protective electronics (PCB) can lead to a short circuit, fire or explosion.
Other properties:

Lithium-ion batteries are thermally stable and are not subject to any memory effect. They work on the basis of lithium and are characterized by a high energy density.

Note:

A special charger is required for charging lithium ion batteries, which charges the batteries according to a special charging procedure. (CCCV = constant current, constant voltage.) The batteries must not be charged above a voltage of 4.2 volts, otherwise there is a risk of fire and explosion. It is advantageous to charge the batteries only up to approx. 4.1 volts, as this significantly increases the service life or the number of charging cycles (possibly up to double). Only lithium ion chargers may be used for charging. However, the cheap chargers sometimes have the disadvantage that they do not switch off safely at the end of the charging process, but continue to charge the batteries with a small charging current, which can be dangerous.

Furthermore, rechargeable batteries and batteries do not belong in household waste! Please dispose of them as prescribed by law at the municipal collection points or in the [usually green] containers provided by retailers.