Here is an app worth watching and or using.
Its battlinesvc V1, It works on my IQ as is right off the bat, though as always, Ymmv.
It puts a very slim line across the top of screen to indicate battery power remaining.
The Author did a nice job and is worth stopping by his thread at XDA an saying thanks to him.
Also, to keep an eye on its development, as the author made it open source and is busy with other things an hasn't created a config file to allow simple settings and adjustments, it only through Reg at this point.
With that said, it works as is outa the box an gives one a visual of their present power levels.
I don't know, But I like it so far, I have used BattClock and others, and have not been satisfied yet. this one seems to handle screen rotations an other little things I have tried with so far ok.
BattLine <-- Click me.
I'll attach some screens to see it on mine for example.
Peace
WR