PIR triggered for game camera, RTC triggered for timelapse.
Someone should make a hat.
Unless the Pi is on all the time no per trigger images can be done, but 3 seconds is ok for time lapse.
Battery life is dependent on duty cycle.
Pi Zero with camera 300ma? ~= 10hours with 3000mahr battery.
turned on 300ma for 5 seconds every minute ~= 120hours
The trick to to make the movement sensor the lowest power possible
I'm dancing on Rainbows.
Raspberries are not Apples or Oranges