T60 power manager battery shreshold won't work, help!!

[chikhao]

I am worrying a lot about my battery life now. I set the threshold to 20%-60%. and I intentionally unplug the AC to let the battery gauge drop to 90% or so. and then plug the cord. the gauge would read 90% for 2 or 3 days, but then for no reason, it would go up to 100%. i don't even know when did it do it. because i would unplug it everytime i shutdown the machine to avoid charging when the machine is closed(my guess, can anybody confirm it with me?). and since rumors said it will not work if resumed from the standby and hibenation mode, I canceled both services also. anybody have any ideas? Thank you sooooooo much!
my power manager version is the latest.