I've been pondering buying a couple to attach to some of my machines. Only being able to ride one ebike at a time, I'd be able to use one 10ah lithium bottle battery with different machines.
I've already adapted an, otherwise, empty Powabyke battery case to accommodate a, (hidden), lithium bottle battery and that means I can provide lightweight lithium power to all my variously modded PB Euros simply by exchanging the pack. (Like Thunderbird 2 exchanges pods).
Thinking about the Yamaha Easy we discussed last week, it too would benefit from being given a bottle battery bracket, allowing it to join my Euro based lithium bottle battery
swingers.