The time to post comments is too short for this kind of product. It appears that these batteries are of the same quality as the M3 (that no longer exists) of the same brand. Their installation in a LED lamp is enough to be convinced of the difference with first prize batteries, especially after one hour of use. Note that when they falter in some devices (eg walkie talkie) they still last very long in a wireless computer mouse, and there they wear out to the end!