These numbers assume you don't have any peripherals plugged into the Pi or power bank that draw power. The power bank should output at least 2A for the Raspberry Pi 3, 2.5A for the Raspberry Pi 3 B+, or 1A for the Raspberry Pi Zero. Most power banks do not have this feature as it requires additional circuitry and is an edge case for most users. The power bank needs to be able to simultaneously charge and discharge in other words, while the power bank is charging, it's also outputting maximum power to one of its USB ports. There are a few factors to consider with this approach: Simultaneous charge/discharge The battery pack gets plugged into the wall and the Pi gets plugged into the battery pack. With this method, you essentially plug your Pi into a high-output power bank: basically, a juiced-up version of what you use to charge your phone while camping. There are a few options for building your own Pi UPS.
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