@ismaelghr , supongo que si Sven Knispel, el desarrollador de BetterBattery Stats escribe lo que se puede leer a continuacion en google play, sera que en kit kat, NO funciona.
BetterBatteryStats does currently not work with KitKat. Google has made some changes breaking the access to the stats BBS (and other tools) are using. We are working hard on finding a solution but the fix isn't trivial. Please be patient. *
Será que no llevas instalado el 4.4:banghead: