Add capability to use with something like Sleepy Pi

[geerlingguy]

Sleepy Pi is a HAT that allows more control over the Pi's power cycle; it includes and RTC and some circuits that can be programmed to boot the Pi on an interval or in response to activity.

I could have the script have a mode where it's called on start up, takes one picture in series, then shuts down the Pi, something like that.

It would likely allow me to extend the battery life into weeks or months instead of 5-7 days, which I currently can get.

[geerlingguy]

There may be some other options too... but I'd like to use an easy, low-profile addon board if possible.

[technovangelist]

also take a look at witty pi. there is a model for the zero and the larger ones too. although they are in czech, delivery was a couple days (though i paid extra for that)
http://www.uugear.com/witty-pi-realtime-clock-power-management-for-raspberry-pi/