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Original poster: Joe 5774
What might be happening is that it is waking up when it sees motion from moving trees or bushes blowing in the wind. Even though those events are not getting recorded they still eat up the battery as the camera wakes up to look at what is going on.
The best idea is to wire them up to 24/7 power by using the doorbell wiring in your house or by getting power to it from something like this:
These are the actual specs for power posted on the Google store
Doorbell power: Rechargeable battery (included), or existing doorbell wires (8–24 VAC, 10 VA, 50/60Hz transformer).