I read this part:

> Replace your battery in 10 seconds without killing the power!

as a suggestion that you'd have four batteries total, and you'd have two that're fully charged, and you'd replace one battery, and within seconds you'd replace the other. Or at least that's how I'd do it.

I've recently read up about power management and battery charging, and want to make a charge controller than can connect two separate banks. I wonder how hard it'd be to change the IP5306 in the Hackberry Pi Zero to handle the two batteries separately.