Am expecting a 4S 100Ahr "A Grade" LiFEPO4 JK-BMS from Amy (Luyuan). In anticipation of using this as a camping battery in a recreation vehicle, about 6 months ago I purchased a Atem Power 40 A DC DC charger model VABG008A. Atem Power come from a company in China - Zhejiang Vicoffroad Vehicle...