Soyachips’ Electric FZR250

[antiscab]

That's some pretty thin wire, no wonder the voltage drops.

The solution is to go to a 4 wire setup.
I would trace out on the circuit board where the voltage measurement is, and connect that to the tabs separately.

The other alternative is to lower the low volt limit by 0.3 to 0.4v, assuming the current is held at 20A constant

[soyachips]

Awesome thanks will give that a go

[francisco.shi]

Those alligator clips probably can't do 20A. You can try thicker wires and pit a ring terminal on the wire and bolt it to the contact.

[soyachips]

Yes I was worried about the alligator clips too so I’ve replaced them and used thicker wire. There’s still some difference but not as bad as before. I’ve now set the LVC on the device to 2.3V to compensate which is actually 2.5V at the terminals.

Thanks for everyone’s help. I think I’m good to test with this setup and work my way through all the cells. From the first lot of testing there were a couple that looked a bit suspect so I may need to source some more cells soon