So charge a range, according to time! This is a rip-off!

Open it up. Have a look at the connections. Just remember what curiosity did to the cat.

So why are you asking us, if even the manufacturer can’t fix it? $20 camera is disposable. Nothing to think about. Replace with something better.

Did you try contacting the seller or the manufacturer?

Buy a better one. Preferably wired.

Faster to (dumb) switch them separately.