David Taylor wrote:

 > If the capacity is sufficient, I can confirm that this device charges
and supplies power at the same time:
 >
 >    http://uk.rs-online.com/web/p/power-banks/7757517/

I can confirm that, and add that the IKEA Solbana power bank does, too.
It is a healthy 10000 mAh, but has only one USB output. It is discounted
if you are a Family member, so the cheapest option for that capacity.

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