I have to agree as I have just received a regular chrome manual battery today. This battery has the black button and is FAR from a 13 second cutoff. It is more like 5-8 sec and then 8 blinks and it will not activate for 10 seconds.
I just got a new pink XL manual a couple days ago with the black button.......has a 10 second cutoff, blinks 8 times and then requires waiting about another 10 seconds before it will re-fire (15 to 20 seconds after it automatically cuts off before I can re-fire it). If I let up on the button before the 10 second cutoff, it will re-fire immediately.....doesn't perform anything like the other six gold button manual XLs I have.