This the best battery app Ive ever bought. The animations/graphics are just awesome. Its also very accurate for me and I use a 2nd gen Touch. You can also change the hours of battery power, especially if you know your battery isnt as strong anymore.
As for the suggestion of the liquid sloshing around...that would really be annoying since you are able to adjust the battery level to see what you would have at diff. percentages...unless they make an option to turn it on and off :)
MissJai08 about JUICE - 12 Awesome Battery Themes