That charger has a pretty good rep, there have been only a few with probs. Don't rag too much on Hobbypartz - with prices so low, its a little unreasonable to expect anything in the way of customer service. That's their business model.
There's not much in the way of competition for the AC6 level/quality charger. The same basic cahrger from Amain is $100, but you will get customer service from them if you ever need it. That's their business model....
http://www.amainhobbies.com/product_...rger-6S-5A-50W
Look familiar?
You might not ever have another prob with a 2nd AC6....