I think Battery Performance is one of the best app to keep an eye to the battery, I have been using Battery ( (by Artur Semenov) but I think this new app have less consume than others... Wonderful design and it seems that this app doesn't drain to much battery life, what do you think??? I think it's a little expensive...it's worth buying Battery Performance??? What do you think, I use the trial version 2 days... Greetings!!!