On Mon, 23 Oct 2017 00:53:31 -0700
Big Bad Bob  wrote:

> There are a LOT of usb power with LiPo or LiIon solutions out there,
> one of which I saw that was solar powered and capable of driving 2.1A
> out of the 5V USB power.  So yeah, shop around and see what you can
> get.  Many are under $20, and apparently under $10.  Some charge from
> a car OR AC adaptor, some require a USB power adaptor to charge them
> (and then they'll supply power for other things up to battery
> capacity).  But yeah, off-the-shelf solutions exist.

The specific problem people are encountering with most of these, and
which isn't often stated in the product description, is the ability to
draw power while the device is charging, because that's typically what
you want from a simple UPS-like thing. Otherwise you might as well get
some lithium cells, an Arduino and a few other bits and pieces, and
make a proper one yourself.

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