The above-mentioned item is a high-quality, compatible battery for your MD-MT 866. It is an excellent replacement battery for your existing or defective MD-MT 866. It can also serve as an additional spare battery for on-the-go use. Handling and charging are as usual, hassle-free with the standard power adapter or charger. A high level of safety is provided by the protection electronics against overcharging and short circuits. The use of high-quality cells allows for a greater number of charge-discharge cycles, resulting in a longer lifespan for your new MD-MT 866 battery. Quality is our top priority. This means all batteries are new and unused. Our own quality assurance ensures a high standard of quality. Note: Unless we explicitly state that this is an original product, we supply a compatible product. This means it is by no means an original product from the manufacturer and is therefore not manufactured or recommended by them. All brand and product names are the property of their respective owners and are used solely for compatibility description.