To calculate the overall star rating and percentage breakdown by star, we don’t use a simple average. Instead, our system considers things like how recent a review is and if the reviewer bought the item on Amazon. It also analyses reviews to verify trustworthiness.
Duracell 9V batteries are fine, but these are quite old. They have not yet reached their expiration date, but I don't really care for buying a 4 year-old product that has been sitting around for some time, or is being sold from some old stock, or whatever.
I purchased these batteries in Feb of 2013. After using one of them for my remote garage door opener, I noticed the expiration date on bottom of batteries is 2012/5 which I am assuming is May of 2012. They are probably okay, but I will not buy any more.