Hello guys. If you have old bosch drill driver like mine, you can build a new battery for your old drill driver. My bosch is 15 year's old and still you enjoy this video and thanks for your support. Parts: Battery case PSR 1440: Li ion battery 3300mah 30A VTC7: 4S 40A Li-ion Battery BMS: 4S Type-C charger: Mini Spot Welder: