Can this 4S BMS work in 3S mode ?

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Oleksii

Member
Joined
Mar 18, 2020
Messages
40
By default - no! But I think after mods on PCB it could.
I analyzed such BMSes in the past and understand how they work, so I have guess how to modify it, but ... does it make sense?
Just by an appropriate one for 3S and that's it.
 

Korishan

Moderator
Joined
Jan 7, 2017
Messages
6,552
Considering that's basically a "dumb" BMS, i wouldn't even waste the time or effort to modify it. Get a real 3S BMS instead. Real as in was designed as such.
As Oleksii states, with modifications to the PCB, you could possibly make it work. But at that point, is it really worth it? Those things are so cheap. 25 lei is about $6USD (not sure what shipping would be, tho). So yeah, would be better to get a better unit to begin with.
 

Overmind

Member
Joined
Jan 16, 2019
Messages
450
It was kind of an emergency and I needed to improvise.
Previously I encountered 5S's modable to 4S by fusing a connection on the board, so maybe a quick trick could of worked there too.
So yes, in this particular case I waited for an 3S to arrive.
 
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