So I recycled some old Samsung li-ion batteries for a portable speaker I'm going to make for my sister. I found this 3.7V 1500mAh one from a Samsung Galaxy Xcover (Something)
How do I charge it and how do I prepare it? It does have a protection circut as well.
Btw, it also has like 3 golden connectors where it connects to the phone. What does those do?
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How to charge this li-ion battery?