Battery Monitor Project

[Bonzabonz]

Our team, 5052, is working on a project and were looking for some feedback on the idea. I have designed a battery monitoring system, that can monitor the voltage of the robot battery and display it onto a simple LED bar graph to provide a quick, accurate way of telling how much charge your battery has. The purpose is to know when it is time to switch batteries for the best performance in competition or practice , without having to constantly rely on a multi-meter.
We were considering producing these in larger quantities (batches of 20 or so) to cut costs and to sell as a fundraiser, since being a rookie team, we are in need of money. I was wondering if there would be a demand for this sort of device, and whether anyone had any insight on how to market something like this.

Thanks,
David