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How to charge multi cell li-ion battery pack ?

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gabri.peic:
Hi i am making a portable Bluetooth speaker for which I need around 24v battery pack.
I am planning on using 6 18650 cells in series. But how do i charge them? I want to have built in mains power supply in the speaker so when I plug it in it charges the battery and switches over to powering directly from the power supply.  So can i just solder BMS to batteries and charge them through constant current board with 25.2v and than just use Relay to switch all the electronics to power supply when i plug it in the wall.

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