Hi, can any experienced Ebayers give me some advice? Someone won the item (a BNIB laptop battery) then complained about postage costs, which I reduced. I sent the item the day after the auction ended. I didn't receive any feedback, so was slightly concerned that it hadn't arrived. The buyer has just messaged me to say that the voltage is incorrect for his laptop and making it overheat and that I am obliged to accept a return and offer a full refund. Is this the case? I am quite happy to, if It is the right thing to do, but as his first communication was to ask for a reduction in postage, & he didn't leave me any feedback, I just want to ensure he isn't just trying it on!