Unprotected, original 18650 rechargeable Li-ION Samsung INR18650-25r with high maximum discharge Current-20a.

The battery sold does not have electronic protection against overcharging and deep discharge.

Precautions:
• To charge the battery, use a high-quality charger with a cut-off charge at a voltage of not more than 4, 2V.
• Do not allow the battery to discharge below the voltage of 2, 5V
• Do not discharge the battery with currents higher than those specified in the specifications
• Do not charge the battery with currents higher than those specified in the specifications
• Do not short-circuit the battery
• Do not carry with metal parts (short-circuit and burns risk)
• Do not allow the battery to overheat above the temperatures provided by the manufacturer
• Do not use batteries with a defective cover/foil
• Do not use batteries with damaged or indented housing
• Do not allow contact with water or other liquids
• Do not solder the blades or wires using an ordinary soldering iron

Cell Data Sheet.