Camera will not charge the battery

I had three of these cameras inherited from a project. All of them exhibited this problem to some degree, so I suspect it's a design issue. Note, though, that there are after-market chargers available for the battery. The same battery is used in several other cameras. Search online using the battery number to find the chargers. They are less than $30.00.

This isn't the best soulution but it worked for me. I cleaned off the contacts on the battery and when I placed it back in the camera I put a small piece of a thick rubber band under the door and closed it. This forced the battery farther onto the camera terminals and I was able to get a full charge on the battery.

Well. Ive got the same problem only ive gone thru 3 batteries trying to figure out what the problem is. When i plug it in to charge the light turns red , then within 5 sec's turns green. It stays green but never charges the battery. After 24 hours, its still a dead battery. Im just assuming since its 5 years old that the internal charger is shot. Looking for a new camera at this time.