My iPhone - iPod charger only works when my devices are completely dead, what is it?

It's weird because according to my knowledge it is suppoused to work fine or not. Help! I don't know if to buy a new charger or what.

.Go to the Apple store or even your phone store and plug into one of their chargers. If it works you know you need a replacement. I go thru chargers like crazy for some reason. A new one is probably cheaper than any other issue so I hope that's it

Weird