sorry if this is annoying. battery energy capacity usually
Ah (amps x hours) and bms current capacity usually measured in
A (amps)
150Ah battery not necessarily need 150A BMS. why? some battery can't do same number of amps as their amp hour number rating (2Ah cell compared to 2 Amps). some 2Ah cells can only do 1Amp if that makes sense.
"low power cell" like 2Ah can only do maybe 1Amp continuously until empty
"high power cell" like 2Ah can do maybe 4Amp continuously until empty
hope this helps, sorry if annoying to focus on that.