I love the idea.
Perhaps it’s not strictly related but I would also gladly welcome a better battery in a few years time, fitting FP5 and using all the newest tech one hears about 
#dreams
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My thoughts behind it is the recycle ability of it, plus if a phone is intended to last a long time, which these are, a lot of us users are going to end up with spare batteries over time, if the battery design is different in say the FP6 and we upgrade, at least we can still make use of them for the new phone as a powerbank, but if the battery design stays the same, then havng a dual charger / powerbank we got spare batteries for both. :).
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I don’t think so. Most users will only order a new battery if the old one is at the end of it‘s live cycle. Although I can understand your use case, a fair powerbank would make more sense in my eyes, than an external battery charger or bulky case for phone batteries.
There’s an interesting item named “SHIFTkeys 2” which I found at another fair phone manufacturer. It’s still in it’s pre-order phase but first operational samples are finished already and presented on youtube. It can hold up to two of their handset batteries in separate internal charging bays in case one would like to have more than just one main battery.
Also for their previous phone model they have designed a pogo pin adapter to fit the latest battery model into the older phones to prevent owners to end up without fresh replacement batteries for their aged phones.
Interesting design as I think.
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