Well, some light at the end of a tunnel: I changed upper threshold from 89% to 80% and it works! Charging stopped at 79%. So, guys, try to change that upper threshold and let us know.

I don't use dock with my R400 so the issue doesn't depend on dock, probably.

My Power manager is also 3.62 but problem appeared in previous version (I don't know the version number). So problem neither depends on the version of the PM.

Dr_st, have you solved your problem? I have the same at the TP R400, WIN7Pro SP1. Thresholds are 30% - 89%, however battery always charged to 100%. Problem appears only a few weeks ago, no problem before (from Jan 2010). Power Manager updated recently, problem persists... any ideas? Thank you.