Tide
Captain
South Korea
Offline
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I have tried a couple of time-lapse session in cold winter with only internal battery.
Day 1 (-3C) : Start with 100%, 50 mins shooting, 40% left
Day 2 (-5C) : Start with 82%, 70 mins shooting, turned off at last shooting
Day 2 (-1C) : Start with 100%, 90 mins shooting, 12% left
Your mileage will be very depend on the temperature.
To extend, I would suggest insulate or keep warm your PO and external battery.
My shooting situation was cold and windy as you can see from the video inked. And I didn't use any insulation or keep PO warm.
https://youtu.be/8ZYE1e5qHRU
My guess is that with 10,000mAh external battery, 5hr is achievable.
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