David Taylor wrote on 6/29/2017 3:33 AM:
> On 28/06/2017 02:51, Rick Christian wrote:
> []> That would be great, if you knew who the OEM was and and there was a
> source in
>> the US... Shipping batteries is costly, and now a days an issue since they
>> can't fly mostly.
>>
>> And that is the key, finding the ones that power and charge... sort of like
>> finding those Oriental HDMI splitters that some how forget to eneable the
>> HDCP
>> on the outputs. :)
>>
>> Even the Adafruit one which would be perfect, has a glitch:
>>
>> "Also, when you start and stop charging the pack, it will flicker the
output,
>> this can cause a 'power sensitive' device like the Pi or an iPhone to
>> reset on
>> the power supply"
>>
>> Its one of the reasons you can salvaget the AC UPS minus the batteroes frm
>> Ebay, and the get extorted on getting them locally, on averarge they run
>> $35/EACH for 12VDC 8AH commonly used in UPS ...unless of course you can
>> purhcase a bunch in bulk. Then sometimes it can work out..
>>
>>
>>
>> Rick
> =========================
>
> Rick,
>
> This one (or similar) on Amazon US claims to be a UPS, and just needs 6
> 18650 batteries.
>
>
>
https://www.amazon.com/Feamos-Mobile-Battery-Charger-Universal/dp/B01H52KI70/re
f=sr_1_2?ie=UTF8&qid=1498721130&sr=8-2&keywords=power+bank+ups#Ask
>
>
> but also mentions a 1-second gap.  Sigh!

I assume you mean when disconnecting the input power it takes 1 second to
restore power to the output?  I didn't see anything that mentions that.  I
did see one review that said it can't generate output voltages above 12
volts when being charged, but that wouldn't be a problem for the rPi.

Seems this unit has a buck converter to generate voltages below 12 volts and
a separate boost converter for voltages above 12 volts all selected by a
pair of slide switches.  I am guessing the boost converter is reused for the
charging circuit so the higher voltages are not available when charging.

--

Rick C

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