This replacement rechargeable battery is designed for use with Braun clippers. It is an authentic item which is supplied by the original manufacturer. Over time batteries will become weaker and eventually will not provide enough power to operate the unit as it was designed. Several factors can cause this, such as improper charging or the way the tool is used along with normal deterioration of the battery. Make sure to refer to the owners manual of your model for the correct installation of the new battery. Keep in mind this high-quality component is sold as an individual item.