Monster Cable Products (perhaps you have their speaker wire), also sells alkaline batteries. The packaging for the batteries claims that they last 25% longer than standard alkaline batteries. Energizer, which, with Duracell and Rayovac, provides 95% of the standard alkaline batteries sold in the U.S., took umbrage at the clam and hired an independent lab to test, and it found that Monster batteries lasts 9% less than those of Energizer. Here is the false advertising complaint via Amlaw.com.
Stickler point: Energizer alleges that even Monster’s own packaging is an admission of falsity. The packaging shows a bar graph comparing MONSTER batteries which last 230 hours, to Brand A, which lasts 170 hours, and to Brand B, which lasts 190 hours. Energizer alleges that 230 is 18% more than 190, not the claimed 25%. That may be, but I’m of the view that 230 is 21% more than 190.