I've got a T3100e, so this may be irrelevant, but FWIW:
Just had to replace the Li battery in mine; cost $15
the last time, $25 today. Since there was just enough
room in there for 2 alkaline AAs in a holder, I thought
I'd give that a try; seems to be working fine so far,
despite being only 3V instead of 3.6V.
Re the HD: when mine failed a few years back, I heard
lots of info that it was an ST-512 drive with a special
connector. Apparently not; installed a standard 80Mb
(MB? mb? mB? :) IDE drive, Disk Manager to get around
the fixed drive type, and Bob's your uncle.
Good luck with the cleanup.
mike