Good information from @AndrewBG.
The thread below has some posts I did in relation to using a larger LiPo for the Pi Juice. It all came down to calibrating the Pi Juice correctly for the battery. I eventually got it to work but it took some time.
I mention this because a fully charged Pi Juice with standard battery lasted about 2 hours connected to a Pi 3B on idle. The Pi Juice battery is large enough to keep the Pi going so it can shutdown nicely or will run during short power outages. I wanted the Pi to run for a few hours on just battery.
The Pi is only used to configure the Pi Juice, after that the Juice just does it thing regardless of what it connected to it.
Cheers
Jim
