Does it have to be battery? Reason I ask I have a couple of these and find them very good, plastic bodied and if you want it to record you need to add an SD card to them (which I have) they can have sound enabled voice too and can sound an alarm, all controlled from my phone. Advantage of Wifi is you only have to run a power cord to them. when it detects movement it sends a picture of who or what to my phone, you can then download to your phone the incident or replay / copy. It can also be used with other items they do to turn on house lights etc when it detects movement. I used the extension cables on mine and used a waterproof junction box that cost pence.
https://www.time2technology.com/en/security-cameras/outdoor-security-cameras.html
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