Delivery was on time, button cells well packaged. Now I have only times one used in a clock and can therefore really nothing to say to durability or do not know how long the clock is running with it. In any case, the button cell is doing so far what they want - without problems. And if I'm honest, even if the battery should last only a 3/4 year - at this price (just under 0.10 per button cell) is real but there is nothing to complain about. Anyway, I'm satisfied and I will definitely buy again when they are exhausted.