Tutor Earth -IT Replacement for HP Pavilion DV7-6170ES DV7-6170SF (65) Laptop Charger 18.5 V 3.5 A pin 7.4mm x 5.0mm With Pin In The CenterLaptop empowers you to work your notebook or charge the battery from electrical power points. If you are running your computer on AC power with a battery installed, power adapter charges the battery (if required) and maintains its charge. When the system is not operational or off, the AC adapter would charge the battery and then preserve its charge. Imported product is made from highest quality parts each Tutor Earth IT replacement Compatible adapter confirms to specifications similar and guaranteed to meet or exceed your laptop's minimum requirements. Each adapter also passes necessary authentication certifications like CE, ROHS etc. before leaving the plant, so you can be rest assured for its quality, durability and performance. Please make sure that you are selecting the correct adapter as per you old charger specification. Please compare your old Adapter Power Rating i.e. Volts (V), Amps (A), Watt (W) and Pin / Tip / Connector Size.