Different battery life on x61 with different power manager software

hi, i recently noticed a bunch of new drivers for my x61 (xp pro sp3) so i installed the power manager 1.52. i immediately noticed the battery usage dropping visibly faster than before (about 1% each 2 min on a 6 cell). i remembered when i had win 2k on this thing and it did the same thing after a bios upgrade.  back then i reverted to the prior bios and the problem persisted. this was one of the reasons i finally went to xp (this was last year).
so this timei tried the prior version of power manager and went back to version 1.48 until my battery usage was normal.
during each driver change i restarted the system upon uninstalling and rebooted upon installation of new power manager software. i also tried different acpi drivers and bios. every other driver change i shut down the machine and pulled the battery out and cycled the battery to make sure. i also tried different usage profiles, including my custom ones and they had no effect on battery consumption - which was alarmingly high: 2:30 at 90% when i usually get more than double of real usage time
nothing i did would give me my normal battery consumption back except rolling back to version 1.48 of the power manager. 
has anybody else experienced this? any ideas as to what the problem could be? thanks in advance

ok, i can confirm its a software issue. the problem was high battery consumption  (-1% every two minutes on max batt and dimmest screen) after updates to power manager driver on an x61 running xp pro sp3. reverting to prior drivers would not solve the issue.
the only solution was restoring the system using acronis and problem solved. my battery consumption is normal now.
i think its a combination of drivers and windows updates that breaks the power manager. ive encountered this problem several times under win2k and xp. 
the only solution i found is reverting to a prior install or a clean install

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