flying with a folding electric wheelchair

Hi @hank

It’s great to meet you this evening.

I’m very very sorry to hear about your current problems.

Sorry but are they (CAA) on different “rules & regs” than the rest of us???

Yes I can pass your post onto Scope to see how they feel if that would help?????

According to my saved PRM form, the batteries are 240 wh.

We were lucky enough to find an almost new one for sale nearby, and I have to say it's basically given me my life back. I've yet to find anything it can't cope with, grass, gravel, cobbles, even the sand that escapes from the riding ring when I go to watch my nieces' lessons, though I wouldn't attempt an actual beach! It very occasionally needs a helping hand from my husband when going up a very steep slope (or a restraining hand going down, but that's my distrust, not the chair) and the front castors have an annoying habit of suddenly jerking out of line if they hit some minor obstacle, but for getting around in general I can't fault it.
The range is truly excellent - we recently did a short break to the Loire valley and I managed two days sightseeing plus the return ferry plus a trip to the supermarket when we got home and it still had 3 'blobs' out of 6. The only time it has completely failed on me was due to cold during 'the beast from the east'. It recharges relatively quickly, either with the batteries onboard or (I believe one at a time, I've never tried it) with the batteries removed, though taking the batteries out can be a bit fiddly, so if you plan to take one on a plane, have a practise before you go.
In all honesty, the seat height is a bit low for me and the foot rest isn't adjustable, however I've fixed that with an extra cushion on the seat, which might be advisable anyway for maximum comfort.
It folds and unfolds really easily, just one catch to undo which I can do with my foot if necessary, though there's nothing to hold it closed when folded so I have a length of double-sided velcro permanently attached to the handle. The levers to put it in free-wheel mode are also easily accessible. 
It weighs 25kg, and hubby lifts it in and out of the car boot relatively easily, though when my Mum picks me up from the station when I'm visiting, we have to accost a passing stranger for assistance as it's a bit much for her. If absolutely necessary because the boot is full, it also fits in the rear passenger footwell in our car, a Landrover Discovery Sport, though it's a bit of a faff to get it in there.
The only real criticism I have is that several of the bolts kept coming loose when I first started using it, but hubby has fixed that with some branded adhesive.
If you do opt to buy one of these, be careful about imitations from the Far East, I've heard some not good reviews about them.

Weight matters. With batteries taken off, to lift separately,  how heavy is it please?

Not sure about weight without the batteries, I’ve only ever removed them for flying. I have trouble removing them because my grip is. Poor, but hubby finds it easy, squeeze and pull basically, no cables or anything. Nothing else needs to  comes off other than my extra cushion, but we usually remove the joystick (one cable to unclip and a button to twiddle) before putting it in the car - it sticks out so could easily be knocked.
I expect you could remove bits if you really wanted to, but they’re not designed to be removed.

Hubby is away all week, but he says the batteries weigh 1 or 2 kg each at the most, so without batteries the chair still weighs more than 20kg.