The batteries are slightly larger and not rounded. But watch anyway in my smoke alarm. At runtime I can not say anything yet. Some complain that they would not endure the ten years, I must say that there not ten years of service life are given, but they are within ten years from date of manufacture usable (best before date). Whence then the manufacturer should also know how much power draws my device !? Indicated by 65% a longer duration than with "normal" batteries.
Update 01/31/14: after almost a year no signs of fatigue, two months ago I heard beeping down the hall all at the same time installed in MFH smoke detectors the same company because they want to re-juice. My stay silent as they had hoped.
