Actually, it looks as though they’re going to be releasing a smart charger which is slimmer and only contains one full charges worth of capacity. I can’t find much information on it just yet though.

That's interesting - thank you! Can I ask where you saw the (limited) information? Hearingtracker forum seems devoid of info on the Zeal and accessories (likely due to the limited fitting range) - but I'd be curious if Oticon are planning a smaller, lower-capacity charger!