What do you guys think about this one that uses a 18650
If I wanted to get a Lithium powered unit I'd get the "T6."
Like this:
http://www.ebay.com/itm/232333734207That's the evolution of the one that Dave was sent. Unfortunately the screen is color, but you get a bunch of extra circuits like infrared and zener threshold if I'm not mistaken. The unit that Mauroh suggested has a nice case with a monochrome screen, but all of these have surface mount MCU's.
A quick scan through my files and it looks like the "LCR-T6/TC" was mentioned on pages 103, 112, 128, 146, and 150.
Page 150 contains a video that unintentionally shows the color TFT screen clear delay. I believe that is the speed with the 8MHz Xtal, so a 16MHz and recompiled firmware should half that delay. I'm not sure of the difference between the T6/TC but they look similar at a glance.
I believe the one Dave has is the "LCR-T4" but I could be mistaken. The T4 Schematic is on page 119, and one of the times it was discussed a good bit was on page 38.
Edit: here's a video that shows screen clear delay, and IR remote (no affiliation)
https://youtu.be/8Fk09QxJrh8