Unprotected, ORIGINAL18650 LG INR18650 MH1 Li-ion battery.

The sold battery does not have electronic protection against overcharging and deep discharge.
Lithium batteries in sizes 18650 with protection are available here.

REMARK!
When using lithium batteries, they should be used together with PCB protection systems or BMS battery management systems, which ensure the safety of their use – they protect the cells against overcharging, overheating, excessive discharge and short circuit, as well as have a positive effect on their service life.

Precautions:

– high-quality chargers with charging cut-off at a voltage not higher than 4.2V should be used to charge the battery
– do not allow the battery to discharge below 2.5V
– do not discharge the battery with currents higher than those specified in the specification below
– do not charge the battery with currents higher than those specified in the specification below
– do not short-circuit the battery
– do not transfer with metal elements (risk of short circuit and burns)
– do not allow the battery to overheat above the temperatures provided by the manufacturer
– do not use batteries with damaged cover/foil
– do not use batteries with damaged or dented housing
– do not allow contact with water and other liquids
– do not solder plates or wires using a regular soldering iron