A battery protection system in any device that safeguards against battery malfunctions.  It is effective against basic issues like overcharge or short circuit.To really understand why battery protection systems are so important, you need to know what can happen if they’re not in place. There  three main things that can happen they are:                                         

     a.) Overcharge : When you put too much charge into a rechargeable battery,that extra energy becomes heat. The temperature of the battery can rise beyond safe limits and reduce the battery’s lifespan.                                                                                                             

   b.) Over Discharge :   Draining too much of the charge from a battery can damage it in several ways, including decreasing the capacity of the battery, causing it to require charging more often, and causing a short circuit within the battery. If a lead acid battery lacks a protection system, it is highly prone to these and other malfunctions related to over-discharge.                                                                   

   c.)Over Current :   Too much current within the circuit can result from a number of malfunctions, including short circuits. If there is enough excess current,it can ignite components of the machinery and cause a fire.

 CONNECTION  DIAGRAM  FOR  BATTERY PROTECTOR :