lithium ion battery pack

I have a 12v rated adaptor but the output voltage it is giving is 13.7v which is very high to charge a 12.6v 3s lithium battery pack. So need help to understand this circuit and how to make this circuit produce 12.6v

Hi guys and girls, I need your help! I have several standard 5v relays, you know the type standard blue Square blocks. They are rated 30v DC or 250V AC I need to use them for 40-60v contactor, about 0.10- 0.15A current draw. (11w during making contact, 7w continue) The Contactor does higher...

Hello there. I have a lithium ion pack that I would like to use in a project to power lights for my bicycle. But I don't fully understand the pinout of the wires. Could someone explain to me how to connect wires up so I can charge this battery.? Also what type of charger I should use to charge...