Owning nearly a dozen assorted electronics that require the use of this size battery (AA), I was constantly visiting the local 'Big Box' store for replenishment. I purchased this product with the mindset that if only half of the batteries worked, I was still ahead of the game cost wise. Lo & behold, not only did the batteries work, they exceeded the normal replacement time of the previously used 'Named Brand' batteries by about 25%! And at about 1/3 of the price, I am "VERY HAPPY"! I did NOT find a bad battery in the box, and I am on my second box of 100. This has been a very pleasant surprise.