Help wiring Bluetooth Speaker

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Hi everyone, sorry for my English but I'm Italian. In this quarantine period I'm going to build a bluetooth boombox, but I don't know if the wiring diagram is correct. I have no experience in electric circuits, so I ask you if it could be correct. In the diagram I separate the DC power in two parts becuase I want to charge battery with the correct current keeping it isolated from the amplifier and concurrently give to amplifier the power that it needs using the remaining current from the DC input. The main question is that I don't know if this can be a good solution. Thanks in advance!

An externally hosted image should be here but it was not working when we last tested it.
 
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