I had the same problem with some DC50s. I had them in my storage box on my dogbox and they were fine when I put them in and two weeks later every one of them had dry rotted and cracked all to pieces. They were all less than 6 months old. I called Garmin and they replaced them all for free.

Mine are fairly new so I have not had that problem however I do have just one collar that will be fully charged and the light will remain red like its still charging. Once I cut the collar on look at the info it says its fully charged and it tracks fine. Do you know how to fix that problem

Greg, take a wire bursh and clean where the charger hooks up, that will usually get them to go green, none of mine go green because I never clean the contacts but they are fully charged, but if you clean the contacts should make em turn green.....

Ill try that when I get home

Tawney give me a call 910-470-7049. I have had that problem as well but I found a way around it I think.