Clone of battery monitor was done for two reasons,

• Showing only single battery instead of 3 dummy
• Simplified user interface instead of one in desktop

However upon investigation battery monitor showing 3 dummy battery is
possibly bug in upower, and those needs to be blacklisted in either,
powermanagement dataengine or battery monitor.

And as for simplifying the user interface, I guess desktop battery
monitor should adapt based on platform it is being used in.