Massive Battery Life Difference - Video Doorbell 3 vs. Stick Up Cam

Hi, Just bought a video doorbell 3 plus 3x stick up cams. Love the system however I have noticed a massive difference in battery life between the stick up cam and video doorbell 3. Have researched and tried everything, but still have the problem. Video Doorbell 3 battery lasts ~14 days with ~ 90 events Stick Up Cam battery lasts ~ 45 days with ~ 400-500 events All devices have good Wifi connect (in fact the doorbell has the best), Only 2 motions zones set, Sensitivity is set to mid range, motion verification on, motion frequency is standard, motion schedule on active during the evenings only. Have tired different batteries, still the same problem.Would expect the same battery drain between the devices as I assume it uses the same technology Can anyone explain why there is such a big difference in battery life? Any help/recommendations welcome, thanks.