Cheap And Discounts 16S 48V 20A 30A 40A 50A 60A BMS Battery Management System PCM PCB for Lifepo4 Battery Pack With Balance Wholesale. Buy Directly From Merchant E-Fire Battery Pack Parts Store. Enjoy ✓Free Shipping Worldwide! ✓90 Days Buyer Protection. ✓Easy Return. ✓Money Back Guarantee.