I bought same 4 Lifepo4 280 off aliexpress(paid $170 more yuks), came 3wks ago, bought craftsman toolbox, also have Daly 150a (separate) Lifepo4 BMS, but found out high volt detect is 3.75+-.025(too high), low Volt detect 2.2(too low), also AiLi Tr16 current display, guage meter, copper bars 1"...