Agreed. Couple years ago I bought three batteries from a guy that had just crashed his new H. It had only been flown twice.
After being informed two of the batteries had yet to be used, with one battery only having two flights on it I bought all three as the price was really good. So they arrived and I found that two of the batteries were indeed unused and NIB.
The third, used, battery quickly revealed why he crashed his H. It arrived in a 12.3v charge state and would no longer provide more than 4 minutes of flight time. That was the first and last time I bought used batteries.