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Any ideas on what kind of powerbank / battery to couple a RPi with for some outdoor action? A friend at work did some tests with his powerbank and his Pi2 was burning through it pretty quickly, and I don't suppose Pi3 will be any better.

Also, I love the sewing electronics into the backpack part :).

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haha thanks! I lazily just used a Anker power bank: https://www.amazon.co.uk/dp/B00D5T3QK4

For power efficiency stuff, check this out: http://www.jeffgeerling.com/blogs/jeff-geerling/raspberry-pi...

Thanks for the links! I guess I need to get myself a decent power bank (or make one out of all those li-polys I came back with from China). I see people recommend Anker all over HN (and Reddit, in particular Ingress players seem to like it, and that says something) - I'll probably shell out for one of those, as I don't trust any of the locally available brands (and I definitely don't trust any consumer product from Aliexpress (components are fine though)).

How long until it was drained?

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