I'm just got a few new lipos (below) and I'm am having some issues charging them.. it am using the ascend radiant charger and it have charged lipos with no problems with it. But with these two battery's they just won't fully charge.. they charge for about a half hour and then it will say they are done.. when really they only have about 1000-2000mah in them. They last about 5mins max II have been looking all around the internet and have not found anything. If you know how to fix this it would be greatly appreciated. Thanks. (Also i am charging them at 1c)

Batteries:
Venom 5000mah 2s 40c lipo
Venom 5400mah 3s 20c lipo

Charger:
Ascend radiant