I have made a battery pack to power up my Raspberry Pi 3 for a project. The pack uses 2 Samsung ICR 18650 Li-Ion batteries (connected in series) and a 5V 3A UBEC and gives 5.05V output.
Now I'm a bit nervous trying to connect this to my RPi, the UBEC has a GPIO connector on the output end. Initially I just wanted to cut that off and replace it with a micro USB plug and just power up the Pi the conventional way, but then I thought that using GPIO to power up might not be a bad idea as well.
Honestly saying i don't want to fry my Pi just by powering it inappropriately. So which way do I choose, GPIO or microUSB?