On Mon, 09 Mar 2020 16:17:45 +0000, Jan Panteltje wrote:

> On a sunny day (Mon, 9 Mar 2020 14:15:17 -0000 (UTC)) it happened Martin
> Gregorie  wrote in
> :
>
>>Has anybody tried running a Pi Zero from a single LiPO cell such as
>>you'd use in a RC model aircraft or a drone? The voltage varies with
>>charge from 4.2 v down to about 3.7 v
>>
>>I think it should work since the Pi has a regulator that drops the 5v
>>supply voltage to 3.3 for internal use, but I don't know what minimum
>>voltage the internal regulator needs to work correctly.
>>
>>FWIW, I'd prefer to avoid using a standard off-the-shelf 5v output power
>>pack because:
>>
>>- They're are rather bulkier than a bare LiPO and, if possible, I'd like
>>to get a Pi zero plus the battery into the space behind a Pimoroni
>>HyperPixel - 4.0, which is 86mm x 56.5mm
>>
>>- Almost all power packs only have a single mini USB connection for both
>>charging and power output, so it would need a additional wiring and at
>>least an external socket plus plug to avoid the need to unplug it from
>>the Pi to charge it - adding more bulk and fiddling.
>
>
> No Pi zero here, but ebay is full of things like this:
>  https://www.ebay.com/itm/274214185023
>   It has a separate charging connector. Has a small switcher on board...
>   9 USD.
>
Interesting, but annoyingly, no dimensions are given.

I'll not be settling on the exact battery pack until I've got yhjre Pi
zero running with the HyperPixel and can measure how much power it needs,
which may be quite a lot since it will be used outdoors and may be on for
much of a summer day.

The one number I'd really like to see is the current used by the display,
but that's apparently not published. So who knows - I may be forced to
use a bigger battery and end up sizing the encclosure to suit the battery
rather than the display.

If the display determines the enclosure dimensions, the overall size
could be something like 90 x 60 x 20 mm or even slightly thinner.



--
Martin    | martin at
Gregorie  | gregorie dot org

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