Requests like this recently increase (not just in the forum). Let’s not forget to at least mention the option of universal chargers.
If any of you feel like it, have a look at this one, at first sight it seems to be a plausible option as well: Ansmann Photocam Vario 1001-0019 Kamera-Ladegerät Will it reach the FP3 battery’s contacts?
P.S.: I wished there was the one forum guide for this, but the topics I found searching for “universal charger” all seemed to eventually come back to @AnotherElk’s suggestion (currently unavailable; I chose the first link because it provides at least one first-hand confirmation that it once worked).