When you check your battery usage, a list of resources will be shown along with their battery usage.
All of the percentages equal 100% .
As one resource percentage goes up, the others will drop. The screen on my Thunderbolt, along with my Incredible, use up most of that 100%. When I had the Bionic, that percentage was far less. The screen the Bionic uses pulls very little from the battery. It's percentage was around 10%. Since it pulled very little battery, the other apps and resources would show a higher percentage. I was amazed at how little battey power the screen on the Bionic used, but the trade off was having to see pixels on the screen.
The battey percentage on the Thunderbolt will always be high, because the type of screen it uses is power hungry.
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