During disassembly of my T4220, I came across a set of perhaps coin batteries inside a yellow plastic-molded casing tucked into a small portion above the battery compartment.
I haven’t tried swapping the main battery during normal operation (don’t want to take that risk) or when it is standby/sleep mode. If you are a T4200 series owner, do you have any experiences with this? I’ll come back with my findings in a later post.
