How about a radial solenoid motor for an aircraft?

[onetrack]

No, the battery change will be straightforward, and need no skills or paperwork. But if the authorities see this in your electric rig, I reckon you could be deep manure! 

 

[old man emu]

I honestly didn't think a plug 'n' play swapping of battery packs would fall into the "changing components" rule, but you've got to prod the discussion occasionally.

 

 

 

[spacesailor]

But putting in a new wire harness,  could be an alteration.

 

spacesailor