Identify or design battery backup

[ke4roh]

2Ah 5V battery needs to keep the SOHO radio running when the power is out. It will be good to notify via GPIO to conserve power.

[ke4roh]

This could work https://www.adafruit.com/product/1566

[ke4roh]

That one isn't good - it won't charge and supply power simultaneously. This one will, though. https://www.adafruit.com/product/1959 . It holds as much charge as I specified earlier. It will be good to verify how much discharge there is, but including one of these in the box would be good practice even for v1. (even better if we could tell the battery is near death..)

[danielwdunn]

I've had good results with this battery with other Raspberry Pi 3 projects:
https://www.amazon.com/Anker-PowerCore-Ultra-Compact-High-speed-Technology/dp/B0194WDVHI/ref=sr_1_3?ie=UTF8&qid=1506871518&sr=8-3&keywords=anker+portable+charger

[ke4roh]

According to the customer answers on the Anker, it doesn't support charging and using simultaneously. We'd have to have some additional circuitry to route mains power to both the battery (when it's not fully charged) and the RPi, until mains power died, and then switch over to getting power from the battery. That 1959 battery will do both at once, which helps. (A bigger battery would be nice, but the smaller one would do for awhile.) A more diligent model would go into a power-saving mode (turning off peripherals and such) when running on battery.

[ke4roh]

Pretty good: https://www.adafruit.com/product/1565 - might work 3-5 hours?