I think battery operated and wireless connectivity is doable. The sticking point at least for the research I did today is the local storage. Blink said they would add a Local storage via USB during a firmware update. That was late last year but I can't find any confirmation that it happened.Battery operated and wireless connectivity? Good luck, normally its one or the other, let alone saving locally.
This may work, if you only need the past 7days.... its free cloud storage. With any battery operated cam you will need to recharge them every so often so it may help to locate them in a somewhat easily accessible area. http://www.arlo.com/en-us/
