T420 power use

Hi,
I bought a T420 partly because it seemed to have great power options. I intend to use the laptop on a sailing boat. At times, I need to run power hungry CAD software, and the machine does that just fine. When I'm at sea, I need the laptop to run on minimal power (just displaying navigation software, and running the internal GPS, keeping a log)
Today I took the laptop tp the boat and connected it to the 12v boat battery. I was disappointed to see that it was using around 1.5 amps. This was after using the power manager tool to minimise power use, lowering display brightness, quality, turning off wifi etc. The laptop battery was already fully charged beofre this test, so the power wasn't being absorbed by that.
I thought the T420 could run using just 7-8 watts, so I was expecting to see my ammeter show just over 0.5 amps, rather than 1.5.
Puzzled, and disappointed.
John

First of all try to re-attach the battery.
If it does not help, follow ThorsHammer's tip:
remove Powermanager
remove power management driver
run ccleaner
install power management driver
install powermanager
My home-forum: http://www.thinkpad-forum.de
Wiki: Deutsches ThinkPad-Wiki English ThinkWiki
My ThinkPad-Collection

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