Steve Drain wrote on 10/23/2017 10:37 AM:
> On 23/10/2017 13:36, rickman wrote:
>> Rob Morley wrote on 10/23/2017 7:16 AM:
>>> 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.
>>
>> I have yet to see one I  would call "proper".  There was one that did
>> everything it was supposed to do, but it was from Europe and was a bit
>> pricey.  None of the others would do everything that is really required.
>
> I have recommended the RS brand power banks in the past. They do the power
> through, but I have had the output switch off on occasion, perhaps through
> overheating.
>
> I can recommend the IKEA Solbana at £25, but &19 if IKEA Family. It is
> 10,000 mAh and I have been running one for months as a UPS.

As others have pointed out providing power is only part of the requirements.
  There need to be signals for indicating the power is running down and the
device needs to shut down gracefully.  Also there needs to be protection to
prevent over-charging the battery or running it too low.  Then there needs
to be a way to shut off all power to the device being powered and options on
how power is restored.

--

Rick C

Viewed the eclipse at Wintercrest Farms,
on the centerline of totality since 1998

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