It's difficult to rate a product like a watch battery since you would really like to report how long it lasts. That said these Duracell batteries fit and power the calculator for which I bought them. I'm hoping they last years like their predecessor batteries. \nWalmart.com was very easy to shop. I found the batteries and ordered them with a pick up at Walmart selection to avoid delivery charges as I had no other items I needed at the time. I was advised of the arrival of the batteries, which was a little later than the on line promise, and given the bar code required to operate the pick up tower. To that point it's not really all that clear at the tower itself where you should hold the bar code for reading. A more experienced customer, not an employee, came up and showed me where the reader was. Once I held the bar code under the correct scanner location my order was delivered in under 10 seconds. That is really impressive. I will definitely continue to use this pick up at the store option when I have too few items to achieve free delivery. For the record the bar code scanner is right below the clear window on the front of the tower.