This looks similar Pete,
https://www.youtube.com/watch?v=7kqydWLDOcU
https://www.youtube.com/watch?v=TQjicdtDVrQ
https://www.youtube.com/watch?v=X6NETjHiaKE
dunno if it helps at all.
Device looks great for the purpose. 0.1C resolution with 1C accuracy.
Perfect!
I might get one just for a play.
Steve