The above-mentioned item is a high-quality, compatible battery for your Elitebook 840 G4-Z9G66AW. It is an excellent replacement battery for your existing or defective Elitebook 840 G4-Z9G66AW. 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 supply or charger. A high level of safety is provided by the protective electronics against overcharging and short circuits. By using high-quality cells, a greater number of charge-discharge cycles can be achieved. This means a longer lifespan for your new Elitebook 840 G4-Z9G66AW 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 produced or recommended by them. All brand and product names belong to their respective owners and are only used for compatibility description.