Daniel James wrote on 10/16/2017 7:26 AM:
> In article , Rickman wrote:
>> I was looking for a Li-ion power source adapter and found this
>> in the process.
>>
>> http://www.ebay.com/itm/112419803835
>>
>> Looks like it would serve as a UPS for a rPi in many situations.
>
> Pi Hut and others sell the AdaFruit PowerBoost 1000 board that can do
> what you want.
>
> https://thepihut.com/products/adafruit-powerboost-1000-charger-rechargea
> ble-5v-lipo-usb-boost-1a-1000c
>
> It's more expensive, but proven for this sort of application. You need a
> 3.7V Lithium or Lithium polymer battery as well as the board.

Thanks.  This shows there is a market for the product.  It has some
shortcomings though.  Like many small units like this it only charges at 1 A
rate which can be below the power needed by a pi if peripherals are
attached.  I'm not certain as I have not looked at the circuit, but while
the output uses an inductive boost circuit, I believe the input has a simple
dropping regulator to charge the battery.  So the 1 A input will only be
about 1 A * 3.7 V / 5.0 V = 0.74 A output without accounting for the
efficiency of the boost circuit.  Use more on average than that and the
battery won't hold charge.

--

Rick C

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

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