So, today my extternal and universal charger are arrived.
The Battery can fit on the space, there are 2 pin that I can adjust to insert on the contact of battery.
I’m wondering: wich contact (of four) on battery I need tu use with the charger pin to charge battery?
If there aren’t any markings and the seller doesn’t have any clarifying literature, it may be necessary to open up the charger to have a look at the internal electronics. If you can crack it open and post a picture of the printed circuit board inside, I’m sure we’ll be able to figure out which pin is positive and which is negative.