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I'm a hardware newbie, wanting to power my RPi Zero via a Lipo battery, and also have the battery charge without removing it. There are many posts about this, but my question is more about two power options.

  1. I believe you could connect the Pimoroni Lipo Shim into the GPIO of the RPi Zero, and then attach the Adafruit Micro Lipo charger to provide charging capability.
  2. An alternative approach looks to be to use the PowerBoost 1000.

Would both approaches work? If so, what would be the pros/cons?

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Yes, both approaches would work. However, using a PowerBoost would let you change the battery and run the Pi simultaneously, as well as charging the battery at a faster rate (the Micro Lipo Charger only reach 100mA charging rate while the PowerBoost can charge at 1000mA). It's also a less complicated solution.

However, the Pimoroni LiPo Shim has slightly higher current output (1500mA instead of 1000mA). This shouldn't be an issue unless you're using a lot of high-power devices on the same power supply as your Pi (for instance, USB devices can draw over 500mA each). In your case, your Pi Zero shouldn't draw anywhere near this limit. The shim is also less bulky, as it sits right on top of the Pi with no extra cables, which could be helpful in small, Pi-Zero-based projects.

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