Sorry it has taken awhile for me to reply. I currently have 7 cameras on my system. All are set to arm for 8 hours a day (11:30 p.m. to 7:30 a.m.). The sensitivity is set at 8, the video recording time is 15 seconds, and the retrigger time is 10 seconds. I also have them set to stop recording early if the detected activity stops before the 15 second recording time is reached. The battery life on all of the cameras has been fairly good – about 6 months, so far, for all of the cameras except one. I have had to replace the batteries on one camera after about 2-3 months, but that camera location records a lot of videos. As noted in an earlier message, I will experiment a bit with different settings to see how the battery life is affected.