Is Kahlon going to swap
the battery or just refund your money? If they are sending you another battery, you might just wait and try the "new" battery to see if it works.
As far as taking the TP apart, it all depends on how comfortable you feel about doing it. I had never taken my T21 apart until a few years ago when I ran into a problem. Since that time, with the help of the folks here, I've taken it apart several times, replaced a motherboard, upgraded the CPU and installed a new fan/heatsink assembly.
I would recommend downloading a copy of the Hardware Maintenance Manual for your model. It really helps with step by step instructions on how to take it apart and put it back together. You just have to keep the screws in the right place.
Download the HMM here: http://www-307.ibm.com/pc/support/site. ... UYM3F.html