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How do I double the capacity for my project?

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I have two cells "18650" each one is 2800 mAh

I added BMS for each cell.

I want to charge both of them from 5v usb charger.

I want ~3.7v to my project but I want to double the capacity to last longer. so i need two cells in parallel.

My problem is: I couldn't find charging bourd or balancer that output ~3.7v

All of them will output ~7v and I need to lower the voltage in that case again, that way I'm gonna lose capacity "not efficient"

What if I connected two tp4056 bourds, each cell have it's charger bourd but both take voltage from the same charger?
so both bourds gonna be in parallel.

And what will happen if I connect the output of the two bourds together to my project?

Is there any other way to do it?

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