I had a “Diamond Mako,” aka a Psion Revo. Neat device, but I just wasn’t “on the go” enough to really need it. It was slightly smaller than the 5, IIRC, and it definitely wasn’t as good for typing as even a Netbook (another good candidate for a “writerDeck” btw), but it was very slick. IIRC it had NiCAD or NiMH AAA batteries hard-wired into it.