GSam Battery Monitor - Monitor your android devices battery usage.
Chronus Widget - Chronus: Home & Lock Widget is a flexible, stylish widget application that offers hundreds of widgets for your home and lock screen.
Accubattery - Monitor's battery capacity through the use of science
S.Graph: Calendar Clock Widget - S.Graph: Calendar Clock Widget is the fastest-growing mobile application created and published by Laboratory 27 for Android devices only.
BatteryCare - BatteryCare - Application and good practice guide for maintaining and optimizing the battery of the modern laptop
DashClock Widget - DashClock Widget is one of the best Widget application that offers tons of clock and weather widgets to make your screen stunning and interesting.