On Wed, 19 Jun 2019 12:35:21 +0100
"NY"  wrote:


> I've got an Anker 79AN7925 13,000 mAhr battery. I'd occasionally
> wondered about using it as a UPS for my Pi, but I've just tested it
> and it does what you feared: the output power is turned off whenever
> the battery is receiving power from a mains source. Grrr.

So use a mains relay to switch the RPi between a wall wart and the
battery pack, perhaps with the addition of a capacitor across the RPi
input to cope with the switchover.

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