Can I just open a charger, and simply desolder the cable from board, flip it and solder it back so it becomes (+)(-) to (-)(+)?
Yes, provided there isn't a third wire hidden somewhere.
Unsolder the wires and solder them the other way around.
View attachment 420755
Please do.Don't make me draw you a circuit diagram in Paint
Just curious tbh. Couldn't find the answer by googling as all the results I get is "just get an adapter".You can also get adapters that will reverse the polarity, got one with a kit.
Also, disappointed by the lack of Dr Who in this thread:
https://i.ytimg.com/vi/YfqvbwVi8XA/hqdefault.jpg
Please do.
Just curious tbh. Couldn't find the answer by googling as all the results I get is "just get an adapter".