PowerStack and battery adapters

I tried using a DM18RL to Ryobi adapter, and the PowerStack powered itself off instantly.

I wonder if anyone's tried hacking that out to enable the new battery to work? I understand that there should be a low voltage cutoff added too. Thanks!

EDIT: only other useful threads I could find are

https://www.reddit.com/r/Dewalt/comments/13y6sqt/5ah_powerstack_battery_not_working_on_milwaukee/

https://www.reddit.com/r/Dewalt/comments/rzxifk/project_farm_tested_out_the_powerstack_today/

EDIT2: Dewalt power stack disassemble and fix (youtube.com)

EDIT3: 5Ah PowerStack issue only, the 1.7Ah seems to work fine on adapters. Can't figure out what the battery wants from the TH pin yet...

EDIT4: so the C3 that gets connected is now at 11.5V, with the B+ at 19.5V.

The TH pin gets pulled down to 17V when the drill is running. It reads 17kOhm initially, then drops to the 12kOhms thermistor expected. I tried putting a 26.4kOhm between C3 and TH, but didn't work. Maybe something around 37.4k was needed.

Now I did see a video where someone mentions the big PowerStack didn't work with their DeWalt vacuum. That got me thinking that the inrush current may be too big for these cells, or the overcurrent protection cuts it out too early. Considering that DeWalt has their BMS in the tools and not in the battery, maybe for the 5Ah PS they thought it would be needed.

Next step I'll try adding a capacitor and/or NTC thermistor to buffer out the inrush current draw.