That AC/DC charger prob has limited power - AC/DCs usually are limited to 50watts and there's nothing wrong with it, its just a high end type AC/DC charger. You can get pretty much the same features in a $55 Thunder AC-6 charger from Hobbypartz. This is also a 50watt charger, but at the other end of teh cost spectrum -
http://www.hobbypartz.com/thac6smbachw.html
It will do all chemistries and is a balancing charger with storage mode for lipo as well.
Here's a local thread about he AC-6 -
http://www.rctech.net/forum/radio-el...6-charger.html