After getting a cheap 7" SD monitor to use as an external screen for my camcorder, I had a problem. The internal battery died quickly (is that why it was on clearance?) and I could only power the thing when I was near a wall outlet. As I mostly use this with The Frugal Crane, I needed a way to use the monitor even when wall power was unavailable. I remember Deejay over at DSLR Film Noob using these 10-12v eBay rechargeable batteries and a power cord adapter that was a perfect fit.