Since, as far as I can currently tell without buying basically what would be for me a 4th GRE-800 by buying a WS-1080, I already have enough, for now, HH scanners of this ilk I'm throwing in my 2 cents about battery type usage.
I used to almost exclusively use the very best rechargeables and chargers taking great care charging and discharging them. Over the years I found myself with a multitude of boxes with dead `rechargeable' batteries and discovered that if I wanted to get rid of them `correctly', even living fairly close to a `metropolis' that supposedly had a place or two where I could take them for disposal I had to go through all sorts of hassles doing so.
Then, on top of all that, no matter what brand HH radio or scanner I had I discovered that even with taking care of how I charged them with the charging circuits in the scanners/HHs *or* with my `special' `dedicated' chargers at home I was not getting the `life' one should expect out of them. At that time I was also working in the electronics `industry' (For a while I actually worked for `good ole' "BatWings' selling and maintaining both mobiles and HHs for both private and PS systems.) and started talking with several others doing the same about this. While we really couldn't easily convert the `commercial' HHs over to being used with `disposables' (There were *some* attempts made by some of the more `adventurous?' people in the group that did cobble together some `interesting' ideas!) there were some more `general user' units available from others at that time that *did* offer battery packs that used `disposable' batteries that we were able to use as `testbeds' *and* we quickly discovered that as long as it was possible to provide external power for a reasonable time in use even with the `state of the art' at that time it was pretty much a `wash' both in `useable time' and basic cost of `use' using the `disposables'. (BTW, we did try quite a few different `protocols' with both individual `cells' / `batteries' along with `factory' `battery packs'.)
Now I *will* grant that there have been some great strides made with *both* `disposable' *and* `rechargeable' between then and now. But, even for quite a few users, these days, *especially* `scannists' and the more `casual' HH users, keeping a pack or two of high quality `disposables' around as the `normal' `gear' along with also taking advantage of a `mobile' power cable/adapter, and maybe also a proper `wallwart' one can get a lot more useage `time' with the `disposables' than with the `rechargeables'. (Add in the fact that one can pretty much also pick up quality `disposables' just about anywhere and, at least for me and a lot of other people *I* know and am around, `rechargeables' take a `backseat' for my HH scanners and even the occasional `walkietalkie'. [Unfortunately I *do* have some `walkietalkies' that don't take `disposables' very willingly/well and I basically `live with' that when I use them.]) BTW, I am *not* a `money bags' person. I'm basically a poor farmer just doing my best to keep the family farm and am proud to be the fourth generation on said farm.
I *do* realize that for some users/uses `rechargeables' are the `batteries of choice' or `what the particular device was built with' and that is what one `lives with'. But, to dismiss `disposables' over `rechargeables', I feel is just somewhat of a false limitation on whatever piece of equipment may be being used. (And, also yes, I also know that some equipment may not be able to perform completely `up to specs' in some areas of said specs for various reasons. However, if all you can come up with *are* `disposables' and you really need said unit as long as you have the ability to get what needs to be done `disposables' shouldn't be dismissed `out of hand' just because they are `disposables'.
In my case my HH scanners are also my mobile scanners as I really cannot see basically duplicating what I use driving and walking around. Also, with the way a lot of the newer vehicles are these days finding a `safe', in more ways than not, way to mount a dedicated `mobile' scanner is near impossible to do without a lot of `hackwork' or making it harder to use. It also helps make it a lot less to be a possible `smash-n-grab' `object' with all the associated hassles that come with that. (I can keep my PSR-800, fairly well `hidden' be it under a coat or jacket or in my shoulderbag with a fairly discrete single piece `earbud' for listening while `afoot' and then drop it into a cupholder or slot while in a vehicle.)
Oh, well... Just my 2 cents worth. Your mileage may vary.