DIY Li-ion 20C 48V 10Ah Battery Pack for Brushless Electric Lawn Mower

I bought this brushless electric lawn mower from China without a battery for my farm. It runs with 48v battery. Brushless electric lawn mower - Rated voltage 48v - Power 800w - Rotation speed 10000 r/min for string and 9000 r/min for blade Battery Pack - Voltage - Continuous discharge current 35A (MAX) - Recharging current 8A (MAX) - Capacity 10Ah - Battery li-ion 18650 52 cells - BMS 13S35A