Product description 
4S100A 12V Lithium ion Battery Management system (BMS) is designed specifically for lithium ion  pack of nominal 14.8V 4 series cells of 3.7v.  It can measure, process and use the real time data of the battery to ensure the safety, stability and long life of the battery pack
4S100A 12V Lithium ion  BMS has following salient features
The protection of batteries from over-charge, over-discharge, over-current, short-circuit
Short term waterproof to protect battery pack from extreme weather and tough dynamic conditions.
Common Port design - 2 wires only, Charge and discharge port share the same port.
BMS comes with balancing connection wire connector to reduce the wire complexity and number of solders.
Dust proof, shockproof and anti-squeezing, protects circuit from external damages.
BMS has passive balancing function which gives long life to the batteries.
The appearance is sealed by injection moulding process to improve moisture-proof and oxidation-proof circuit components and prolong the service life of the products and batteries.
The BMS 4S 100A comes with equalization function which facilitate to keep the cells at same level and ensure prolong life. The components used in the BMS is
1) Highly integrated IC,
2) low resistance MOS, and
3) high current equalizer.
Battery Management System for 12V 4S100A battery pack configuration of Lithium Ion cells.
Over Charge Protection: Yes
Over Discharge Voltage: Yes
Short Circuit Protection: Yes
Cell balancing Yes
Over Current Protection Yes