bloody hell...nokiabot....can't resist...
yeah...I can't help mucking about with something new.

IF:
1- the regulator (and necessary parts) can be equal to or less in thickness than the width of a standard Nxx0 battery....

2- I have said parts in hand... lined up precisely where they need to fit... so I can efficiently do the work properly, exactly and quickly ...

3-yup there is then no reason why I can't carve 3 antler dummies for the n800, the n810 and the n900.

4- At which point all three can be sent for casting in a cheap high heat resistant resin...

5- Stupid easy then...
A- End user only needs same (affordable, available, and exact) parts that fit ...
B- Pop them in the obvious vacant spaces on the dummy cast...
C- Drill / cut a usb port hole on the device removable back...for utilization of permanent usb power option
D- Make sure there is plenty of wire length from dummy battery to the back to facilitate the normal easy removal of the back from the device (since mounted port connection on the back) OR make the
usb power port hole on back slightly larger..pop in a rectangular rubber ring to easily pop the usb port on or off (depending on the individual desire to use it with a proper battery ..while they still exist and are usable...or with the dummy battery as a permanent power option until the crack of doom, the moon falls into the ocean, or electricity as we know it fails utterly....)

6- For the end user....the production cost in resin is miniscule...... the Nxx0 device line now becomes power supply self-reliant....like all proper computers should be ...

better even.......
(since (and correct my lack of proper electrical education here if I'm off) now that there is proper power regulation to the device via standard usb....(technically wouldn't it be logical that any type of plug-in-able power bank and /or subsequent global-marketplace-common / standard-usb-connector devices and methods of charging said power bank...solar, outlet, wind-up, kinetic etc...(are everywhere nowadays and affordable to boot )... that it would be also feasible to charge said external bank while device is in use...

so it stands to reason that 24 hours ...7 days a week your device could keep running without stop...regardless if standard electrical power goes from a blackout or not. (I know it's plausible since I almost have a full 24 hours of solid use with my solio classic ... solar during the day and then...once dusk hits working off the solio battery... and then when the solio battery empties... finally working off the n800 battery...
trick is ...the solio classic line ain't young anymore and like so many other power option devices for the NIT ...eventually there will come a time when nothing is compatible...especially with the older n8x0 original power port...)

making an affordable , easy to install and use, globally common power option now ...
(while we have the luxury of time and foresight to see it coming...)
safeguards our power options in the future before that window closes...

Bluntly...What I'm saying here is...
we can either create the option for our older devices' continuance into the future or...
we willingly give up that freedom when the very last compatible battery is sold....
then it's just borrowed time after which... literally....
the lights go out for the Nxx0 device line.
I'm not trying to instil fear or terror or doom...
the process... It may take a bit...but our devices are tied to the damn batteries...and that means we are tied to suppliers...suppliers who stop making old batteries eventually and move on to more lucrative contracts that have more people in need of plenty of batteries for newer devices...just the way things are...
So it is a choice... we have for now... time to make...but not forever.

OR
...if no one else is interested in this...
I'll make the protos ..post schematics, dimensions, blueprints, whatever...y'know ..the results..
I most certainly want this kind of seamless internal (sans-external-plethora-of-exposed-parts-wires) battery-less option...I see the need for it... at least for my own devices future continuance...