That's exactly what it says. Not difficult, but probably expensive. My guess is that Jolla can't just have 100 spare batteries produced for the few people who have asked for them so far. (I tried a quick search on TJC: Questions about spare batteries or other parts have less than 100 votes.) They'll probably need to order a certain minimum number from their partners and are reluctant to do so before they can be sure those parts will be sold. Just my guess.