Cheap And Discounts 7S 29.4V 4.2V Balance Function Protection Board 66mA 7S Li-ion Lipo Battery Lithium 18650 Batteries Balanced Module BMS PCB Wholesale. Buy Directly From Merchant ShenZhen KeXinHui Store. Enjoy ✓Free Shipping Worldwide! ✓90 Days Buyer Protection. ✓Easy Return. ✓Money Back Guarantee.