The documentation says the battery lasts around 3-months even if the solar panel is not working. I’ve had the camera installed for 1 week - it’s set-up to optimise surveillance not optimise the battery, it’s made 150 recordings, the temperature has been around zero all week, and the battery is at 96% (it starts charging only when battery drops to below 97%)

My camera, 1300m, outside, good sun exposure, spent Winter with 80% minimum charge available.