Theres a way to change the cutoff. I have, and still use the indi booster and there is a pot inside that you can adjust so the tray stops at .9 for Ib cells.
The pot on mine is orange but it might be different on yours
Just discharge each cell to .9 using another method, then put the pack on the tray and turn the pot until the green led thats closest to the red led goes out and the red led gets dim.
Hope this helps