7S BMS board with heat sink case. If you are making a e cycle battery with lithium ion battery then you need this bms board to protect your battery from over charge protection, Low discharge protection and for battery good life. This bms board used in 18650 lithium ion battery model and can hold max discharge current of 20A current. 
 
Bms Specification - 7S 20A bms
Special HEAT sink protection.
Battery Full charge volatge - 29.4v
Battery Cutoff volatge - 22.4v
Battery specification - 18650 lithium ion battery 3.7v
You can easily connect up to 500 watts motor in this BMS system battery, like 250 watts, 350 watts e cycle motor.  
Overcharge protection 
Low Discharge protection
Over current protection 
Balanced Charging to each cell