This HP EliteBook 8770w AC Power Adapter can provide continuous power to your laptop/notebook computer and charge the HP EliteBook 8770w battery from AC power source such as electrical plugs on the wall. Power cord plug is not included, 1 year warranty.The laptop power adapter is guaranteed to work with your HP EliteBook 8770w laptop when you see your adapter's OEM part number or laptop model number in our compatible list. The list might be incomplete because it is difficult to collect all information at one time. If you are not sure of your choice, please type the part number and model number as special comment in our shipping form at the time of checkout. We will ship you the correct HP EliteBook 8770w adapter based on your input.Laptop AC adapter can be divided into original and non-original. Original HP EliteBook 8770w power supply is designed by laptop manufacturers for their own specific models, but generally produced by other manufacturers and more expensive. The AC adapter is often not designed for specific notebook models, only the interface, voltage, current etc are compatible, which means that within a certain range they are universal.Welcome to replacement laptop AC power adapters online store.Replacement HP Laptop AC Adapters and Power Supply for Notebook Computers.Replacement laptop AC adapter is guaranteed to meet or exceed original HP laptop AC adapter.Full 2 hours burning test; 3 times quality check and 2 times drop test by QC before package.Warranty and Guarantee: 1 year warranty, 60 days money back.