ebikes.ca has had Brompton kits for some time. And from what I can glean, far superior to Bromptons attempt. ebikes.ca even has 36V TRAVEL batteries that can be legally flown.They originally attempted something with a couple of different suppliers (domestic and the usual suspects) but wasted a lot of time going down paths to nowhere. Brompton are not large enough to call the shots with the biggest suppliers but nothing “off-the-shelf” would do the job without compromising the existing bike. That appears to be the issue. There was no appetite to invent a new folder model to electrify. It had to remain a Brompton. Hence the unique kit. But most of a Brompton is built in-house anyway so it’s not like they don’t know how to manufacture rather than bolt together.
Well, this is my understanding as a customer. It’s been an interesting three months with some problems in the last few weeks. I’m happy.