Cost vs. going up the ladder, swap batteries, re-aim the camera, hope the mount doesn’t break. Doing this in winter cold temps really sucks. How long do rechargeable batteries last? Now you know why having non rechargable batteries go for 3-9 months in reality is more practical. Energizer Ultimate Lithium batteries cost 1 dollar each or 2 dollars a camera to replace. So the cost factor to justify rechargable is not really a good argument.
They way to really do it is a large battery back that plugs into camera usb socket. Recharge that battery pack via solar panel. Set it, forget it, do not climb that damn ladder.