If you want to monitor your battery use with precision, you need to get the corner battery control addon on your laptop. The Rainmeter skin comes with something like a bent rod (shaded in different colors based on battery level) and a number of miniature gauge meters which are also part of the control. With this plugin on your desktop, you’ll be able to know when the battery is balanced, in high-performance and in power saving mode. It is simply the best you can get in terms of tracking your battery use.