The above-mentioned item is a high-quality, compatible battery for your U11 (U11Dual). It is an excellent replacement battery for your existing or defective U11 (U11Dual). 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 protective electronics against overcharging and short circuits. The use of high-quality cells allows for a greater number of charge-discharge cycles, which means a longer lifespan for your new U11 (U11Dual) battery. Quality is our top priority. This means that 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 produced or recommended by them. All brand and product names belong to their respective owners and are used solely for compatibility description.