They can be pretty lenient and accommodating, esp with product failure. They've replaced stuff out of warranty, according to various posters, at their discretion.
In my case, I dropped and shattered my iPhone -- entirely my fault -- and they offered me a free replacement, with only one question: What happened? I told them the truth and about 10 mins later left the store with a new phone after they'd transferred everything to my new phone. When I went in, I was expecting to pay for a repair.
In your place, I'd just bring in the charger and say it failed. When I request help from customer service people, I'm always polite, state my prob, don't go into details unless asked, and don't demand anything. I can't remember when people haven't been accommodating. All I say is, can you help me?
