Really poor battery life, last between 2-3 days tops. Just keeps getting worse, no setting changes. Used to last 8-10 days even with daily ongoing activity. This camera is in my chicken run so it will always detect movement. I know its not the batteries because they last over 2-3 weeks in other cameras with constant daily activity. Tried shorter recording times and longer cool down times but does not affect battery life.
Neither the v3 or v3 Pro have batteries. Are you running them off a USB battery bank or something?
A V3 will draw between 5.5 Ah (5500mAh) or more a day, how many Ah (Amp hours) is the battery you are using?
A V3 sitting idle draws 0.23 ma, and viewing live video, uploading clips to cloud, etc increases current consumption.
I did not have the choice of my exact camera, I have the multiple battery cam pro, I only have this issue with one of them.
If the batteries work fine in other cameras, either the camera has some issue where it is draining the battery, or there is just a lot more motion on that camera. Have you tried swapping with one of your others to see if the issue follows the cam or not?
If it definitely stays with the cam, I’d say try a factory reset and set it up from scratch, something may have gotten corrupted or some setting changed inadvertently etc, where it isn’t doing the power saving that it is supposed to be. If you give it a new (even slightly different) name when you set it up again, none of the settings should download to it and you can set it up like new.
Welcome to the Forum, @dc6593! 
Thanks for clarifying which Wyze Cam mode you’re actually using, because I was initially confused by the first post, as well. You tagged this topic with cam-v3 and cam-v3-pro, but you should be able to delete those and change the tag to battery-cam-pro to help your issue get appropriate visibility. If you’re unable to do that yourself, then you can flag your topic and ask the Moderators to re-tag it for you.
What has Support said about your issue? If this problem is affecting only one of your cameras, then I’d be inclined to submit a log from that camera and open a ticket with Support, especially if you’re still within the warranty period and eligible for a replacement.