So, for an ebike the "bike" bit is largely conventional; you choose style and componentry much as you would for one of those. (And spares are available much like a conventional bike)
The drive type/motor and battery are the key differentiators, and I've touched on those.
To be road legal (without reg, tax, insurance) an ebike needs to conform to the "pedelec" spec. Nominal 250w motor (maximum), assistance only when pedalling (various levels available), and no control by throttle (though a button which will apply assistance when pushing may be available). Assistance must cut at 15.5mph, though you can go faster under your own steam, all things allowing.
Most bikes will be compliant, but there are non road-legal bikes out there.
They're heavy. That makes transportation a matter to think about. I'd rather not use a roof or rear hatch carrier on a car. Inside or a towbar carrier only. Whilst heavy, with decent spec componentry you can cycle with no assistance on easy terrain. I've done in excess of 50 miles along the Mosel using only one short burst.
Battery recharge time depends on brand and capacity, will be quoted, and is a matter of hours for a full charge. Chargers aren't light things to carry, neither is a spare battery. The batteries have a finite life. The 9-year old ones have surpassed expectations (by quite a lot! - though those particular ones seem to be seen as about the best there's been). Regular riding for distance will ultimately need a replacement, which may be in the order of £600-800 for or (though a good few years for all but everyday long distance use).
TBH, the original decision was one of our better ones. They have met the requirements and proven hugely enjoyable. Just be aware that, with a pedelec cycling is not effortless, it can be less effort. It is quite nice to smooth out the effects of inclines and headwinds, and we've done thousands of miles since buying. A normal run out will be 30 miles and above, I think the maximum day out was 63 (with ample battery in reserve)
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