Note: Your old battery should have the same voltage (14.6V/14.8V) to ensure compatibility. The item mentioned above is a high-quality battery for your 919701-850. It is an excellent replacement battery for your existing or defective 919701-850 battery. It can also serve as an additional spare battery for on-the-go use. Handling and charging are as usual easy with the standard power supply/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 higher number of charge-discharge cycles, meaning a longer lifespan for your new 919701-850 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 not 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 only for compatibility description.