BatteryBar VS Battery Life Pro

Accubattery - Monitor's battery capacity through the use of science

BatteryCare - BatteryCare - Application and good practice guide for maintaining and optimizing the battery of the modern laptop

GSam Battery Monitor - Monitor your android devices battery usage.

coconutBattery - With coconutBattery you are always aware of your current battery health. It shows you live information about the battery in your Mac and iOS devices (iPhone, iPad)

BatteryMon - BatteryMon is a battery monitoring software solution.

Greenify - Greenify is a mobile app that gives you greater control over your Android device's power usage, allowing you to get a lot more mileage out of your battery life without having to constantly plug it back into a charger.