When it comes to battery life, remember that they are calculating that based on X number of daytime and Y number of night-time pictures or videos per day. Most hunters don't get that many pictures/videos per day.
I believe TrailCamPro completes a very fair "apples-to-apples" estimate of battery life projections for one cam vs. another. I also usually "beat" their projections.
I did obtain some 1st generation Browning Defender cell cams for which TrailCamPro said battery life would be @ 2.4 months (based on their standardized criteria). In my first test run, with image at highest resolution, immediate uploads, the battery life still beat their projection, but was less than 3 months.
Subsequently, I started playing around with various ways to increase battery life (with cell cams) and still get what I wanted most from them. One key thing is
NOT to utilize "immediate" uploads, but "schedule" them (which you can do frequently during the day). I also change the settings for longer intervals at night, shorter during daylight.
Right now, I have two of these 1st Generations running, batteries changed on both on 12-01-2020, and both were still transmitting today, 6 1/2 months since last battery change. Again, TrailCamPro rated these cams for 2.4 months of battery life.
Each new "generation" of a particular trail cam seems to be obtaining greater battery life. Last year I placed several 2nd generation Defender "Scout Pro" cell cams. TrailCamPro rated this 2nd generation for 10.5 months. Some have already been in place about a year, and I haven't changed the batteries. If they're still going @ July 4, I'll replace the batteries.
Browning has it's 3rd generation cell cam (Defender "Ridgeline") coming out this summer, but TrailCamPro hasn't rated it yet.