SmartMonitor - plug-in displays text representing different parameters of your phone such as battery life, temperature, storage space and available memory. You can also add icons representing any of these things as you see fit
BLifePlugin - During its work Plugin gathers and aggregates the battery discharge statistics. Then it calculates the remaining work time with the current battery charge and current time of the day. The more days you use it the more accurate Plugin will tell you the remaining time