I have a simple circuit on a breadboard with a pi pico running arduino ide and a 16x2 lcd. I want to power it with a flat lipo battery but I cant seem to find the right circuit for my needs. It must be able to:
Charge a 3.7v lipo
And power the project while its charging
I have no idea if a board like this exists but if there is a alternative please tell me.
You will need to know the capacity of your cell so you don't charge it at too high a rate.
Other than that there are small charger modules in the internet shops that will run on a 2A usb power supply.
or this may be preferred.........
What are these boards called? Also capacity of the cell is 4Wh 2000mAh. Would that make it possible to power something at 3.3v while the battery is being charged at 5 volts? Thanks for the help btw
USB lipo cell charge module.........
The lipo you initially referred to was nominal 3.7v.
Now you say it is 3.3v. That would be more like Li ion cell.
The latter module can supply cell voltage while being charged.
If you look, you will see input for usb, output for battery (cell) and output for whatever circuitry.
If you want 3.3v, you'll need to add some kind of converter/voltage regulator to the output.
So I meant 3.7 volt lipo but this li ion cell your talking about might just be the thing I need. I'll look at that vs a lipo 
Also is the module you told me about a TP4056?
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