I know this doesn't help you but I just shipped Two Ebikes from Newark New Jersey to Paris France in the cargo hold and was informed by La Compagnie the airline to bring the batteries in carry on, brought a Rail 625 and Rail 500 plus a Bosch 400, of course stopped when they went through Xray with my Full Face and cold weather rubber and fleece Carhartt gloves. (we had been told Paris was much more lenient than Lisbon, in fact we went through French border control with no questions, or line, just a quick stamp and Merci!)
They were concerned about lithium batteries, explained that it was the same exact batteries in my laptop they were allowing and it was for Two bikes in the cargo hold.. Apparently they have a swab machine that detects Lithium and it was "no alarm" on all Three, they then ran my bag and batteries back through the xray and said good to go. That was some big money so I was sweating it...I