Lithium battery storage success I just checked my spare batt. Type - OEM 9-cell (extended) for T4x series Manufactured - 12-06 (call it 2007) Cycles - 15 (needed less often than expected) Design cap 77.75wh Current cap 76.0
It's commonly stated that li-ion batts go bad when not used, but it depends on how they are not used. I leave it out of the machine unless I anticipate needed substantial plug-free runtime, keeping an old batt in place. I leave it partly charged and in the refrigerator - not freezer. So, after over 3 years it has retained 97% of original capacity. IBM batteries of that time seem to be of better than average quality, YMMV. In my case, leaving a junk batt in while on AC and keeping the good one cool worked superbly. _______________________________________________ Thinkpad mailing list [email protected] http://stderr.org/cgi-bin/mailman/listinfo/thinkpad
