I have no idea how I've been through in the last two years. Of course, they all fail at some point. I personally dont send failed batteries back. I cant justify spending 5 or 6 bucks to send back an item that costs 12 dollars. If I ever ordered 5 bayyeries and they ALL failed in a week, or came DOA, then I would certainly send them back for replacement. Thankfully, I've never encountered such an issue
-VP