New to designing circuits and PCBs. I'm working on a project and I can't seem to figure out how exactly how to do what I'm trying to do. I'm hoping one of you can give me a hand understanding the concept behind a few things I just can't seem to wrap my head around.

Basically, I'm designing a PCB for something that is battery powered but it's in a really tight space so it can't be removed for charging, it has to be charged in its spot. I have some 3.7v 18650 batteries that I am charging off of a TP4056. The batteries are constantly connected to their load and so I need to make a circuit that disconnects their load when the 5v is applied for charging. I'm told a MOSFET will do what I'm thinking but I can't seem to figure out exactly how.

The batteries are in groups of 3, 2 groups per each PCB. They're wired in series to get to 11.1v and in parallel with all the other groups to get me to the current I need. The plan is to charge each battery individually by being wired to the charger in parallel on a different PCB layer. I also threw in an LED as a charging indicator.

Ultimately this is a much larger design and this circuit has to be repeated 4 more times. (I need to fit this design in a pipe that is only 1.25" in diameter so it's about 7.5" total length after connecting (5) 18" PCBs.

Any advice is appreciated! Here's a picture of what I'm thinking will work: https://imgur.com/a/GRv2X

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The TP4056 is a single-cell charge controller. How will you ensure a correct balanced charge of all the cells?

 

The TP4056 is a single-cell charge controller. How will you ensure a correct balanced charge of all the cells?

So, we cant use the tp4056 for charging multiple battery? Hmm ....I want use it for
charging my 8PC's 18650 battery are they need a modification ?