High temperature protection charging and discharging, low temperature charging protection.Temperature control parameters are externally adjustable. <br> <br>Overcharge detection protection.Three stage overcurrent protection.Externally adjustable during the first and second stages of overcurrent delay. <br> <br>Battery disconnection protection function.NTC resistor disconnection protection function.Suitable (Makita) chargers.This product is component without battery core. <br> <br>It is used to repair and assemble batteries pack,only people who are familiar with battery performance and have practical experience in battery assembly. <br> <br>Precautions use and assembly: <br> <br>1) When welding battery leads/sampling points, be careful not to connect them incorrectly or in reverse. If a wrong connection is found, the circuit board may have been damaged and needs to be retested before it can be used again. <br> <br>2) During assembly, the BMS should not directly contact the surface of the battery cell to avoid damaging it. The assembly should be firm and reliable. <br> <br>3) Electronic devices used welding must be reliably grounded, and attention should be paid to electrostatic protection to prevent damage to the protective board caused by electric leakage and static electricity <br> <br>4) Be careful not to touch the components on the circuit board with lead wires, soldering iron, etc. during use, otherwise it may burn out the circuit board. <br> <br>The appearance color of some accessories is random, don't accept the specified color; which does not affect the use, and the actual product does not include batteries <br> <br>Colour:Black <br> <br>Material:Metal+Plastic <br> <br>Package Contents: <br> <br>1x BL1890 Li-ion Battery Case set <br> <br>Only the above package content, other products are not included. <br> <br>Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/