[Solved] Charging Gazelle Electric Bike Battery (36.5V/11.4Ah) with Old 44V/1.8A Charger: Samsung INR 18650

Hello
I don't think it will be that simple, lithium-ion batteries are quite demanding, they cannot be overcharged or discharged too deeply. Seemingly the charger you have, if looking from the voltage side would be suitable, because 40 cells come out, they are connected by 4 pcs. in parallel, 10 packages were created in this way, which in turn were connected in series, which gives 36V. The maximum voltage of a charged cell is 4.2V, so with 10 packages connected in series it is 42V. Pictures are of poor quality, but you can see that there is a lot of electronics there, probably limiter and other protection systems. This charger, which you have, I think I associate it with such a bike, it had such a charging connector. The battery was also 36V 12Ah, but on gel batteries (12V x 3 pcs). It may be better to look around for the original charger

@ wojtas333 Can't you see that the control electronics are there?

@ellavita You need to check what signals are coming to the socket, these two thick ones, you know.
Please take a clear picture of the printed board so that you can see the inscriptions on the integrated circuits.