Magic Wand Rechargeable Charger Adapter

I've purchased four Hitachi Wands over the years, and I still have three. The original one with the cord didn't last very long, and it makes me wonder if the cord was the fail point. I've had to replace the cords on all three of the others. They all failed within a year. I purchased three cords off of this listing to replace. The first one failed out of the box. So far, the other two work, but a 67% fail rate (4 out of 6) is a horrible track record. I'll wait a couple of weeks to get through the holiday before initiating a return. That will give a chance to see if the other two will also fail. If they do, I'll probably end up having to buy a wand from one of the competitors. EDIT: Two of the three chargers failed by the end of the return period. EDIT II: The third failed after about three months.