Batteries discharge when placed into spotlight cam

I have a spotlight cam. The battery was dead. I charged the battery until all green. I hooked a solar charger to it so the battery would auto charge. Plugged in the battery and it immediately indicated red on the cam. Pulled the battery put on charger and charged again until green. This all happened a second time. Thought the battery was compromised somehow so bought a 2nd battery. Charged it for 36 hours to all green. Plugged new battery in and it did the same thing.