SpotLight Cam batteries not holding charge

I have 4 Spotlight Cameras that are mounted indooors. The first time I charged the batteries (LEDs turn green) they ran down in 10 days. The second time I charged them I 'double charged them - i.e. charged until green, then disconnected and charged again until green), then inserted in the cameras. I set the settings to notify me of any movement and only viewed when notified. (3 times on one camera). The batteries lasted 4 months this time. Encouraged by this, I 'triple' charged the batteries prior to a short vacation in December 2019, installed them the day I left and they were flat in 10 days. I had no notifications during that time and did not monitor any of the 4 cameras during that period, except on the occassion I discovered they were flat. I am frustrated by all this. I spent nearly $1,000 Canadian on these cameras and they have been next to useless with the exception of the one time they lasted for 4 months. What can be done? Please help as I'm sure they can't be returned at this point in time.