Accubattery - Monitor's battery capacity through the use of science
Pingdom - With website monitoring from Pingdom you will be the first to know when your website is down. No installation required. 30-day free trial.
GSam Battery Monitor - Monitor your android devices battery usage.
StatusCake - Website Uptime Monitoring & Alerts – Free Unlimited Downtime Monitoring
BatteryCare - BatteryCare - Application and good practice guide for maintaining and optimizing the battery of the modern laptop
Better Uptime - We call you when your website goes down