Rechargeable Work Light Duracell Rechargeable Battery Pack With Charger... Red Light Still On After Charged For 24 Hours?!?

Duracell rechargeable battery pack with charger... red light still on after charged for 24 hours?!? - rechargeable work light

I bought a pack of 4 Duracell batteries with the charger from the camera, and I went online yesterday at this time to load to 4.
It is almost 24 hours later and the red LED.
My camera does not show whether the battery is fully charged or not, point out that if you die, so do not know if the batteries are fully charged correctly.

Someone knows why I get a red light?