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This is my diy UPS hat that i use with my raspberry pi 3. It can power the raspberry up to 11 minuites when the micro usb power drops.
UPDATE: added 2 wires for connecting external li-ion, li-po batteries so it can be used as Pi on the go.
Also added a shutdown button at pin GPIO 17 and GND. You can of course change it to your needs.
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