Spotlight cam - only installed 3 weeks ago but now 27% battery

I installed 2 battery powered spotlight cams about 3 weeks ago (they were fully charged) but when I checked today was shocked to see that 1 of them is only 27% battery.Now we work at home and the house is completely open (no fences etc) so we're always moving around outside but I would certainly have hoped for better than that.Motion frequency is on "light" and I have it on "live view" but I'm wondering if there's anything else I can do ? I really don't fancy having to charge them up every few weeks and I presume battery life deteriorates over time as well ?Help !