=VG= SemlerPDX

Working on a DIY project right now between other things; "wireless TrackIR TrackClip Pro"

I have an old TrackClip Pro with several broken plastic pieces, so I'm using it for all sorts of testing and feasibility checks before cutting up my new working TrackClip Pro.  I want to use a small modern Lithium Ion battery and have the ability to charge it through USB micro-A connection, with a charging circuit, and a power on/off switch, but a few of the batteries I've tested so far have me scratching my head.

If this simple 3x LED device normally operates on a USB 5V 1A connection, I really only need to replicate that.  But I've already had little success with the batteries I have around my house.  I may have to purchase a battery specifically for the project, as well as the charging circuit.  It all needs to be very small and lightweight.

I've read several DIY forums where people already did this exact thing, so I have plenty of ideas for products and procedures.  I'm very patient and I'd rather spend a few extra dollars if it can be a little more sturdy or look a little better, so time will tell how this turns out.  Will take pictures once there's something worth taking a picture of.