Sportligh Security Camera Plus

I have the above device with dual batteries.  It does not have the red light inside the battery compartment.  I have fully charged two batteries and checked to make sure they are fully charged.  I placed one in compartment 1 and the camera recognizes it and works fine.  The icon shows green fully, the second empty compartment show a battery icon greyed out. If I place another fully charged battery in compartment 2, it does not recognize the charged battery.  The battery 2 compartment still shows a greyed out battery.  This happens to about 3 of the six cameras I have.  Once in a while after numerous attempts I can get up to four working with two fully charged batteries.  I have checked for dirt and cleaned the inside and batteries.  I am hoping someone can assist me with this problem.