I got the replacement cells that I ordered, and my Reform is up and running again.
I did the Keyboard and LPC firmware updates today. Thank you to @plattfot for this step-by-step walkthrough. I found it a good supplement to the official instructions. After performing both updates, the OLED battery screen now shows the “On” or “Off” indicator, so I think it all worked correctly.
I also ordered a NiteCore “NEW i2” battery charger that I had seen others mention on these forums. I’ve been able to use its Recovery mode to restore the original batteries that were discharged. It takes one or two minutes in Recovery mode, and then about two hours in LiFePO4 mode to get each cell back to full charge.
Now I have several spare LiFePO4 batteries, but nothing to do with them. I’ll probably look around online and see if there are any useful gadgets that can use this battery. Does anybody have any suggestions for putting LiFePO4 batteries to use?
Thank you @minute for your help and support.