Employed high quality cells from Samsung, the brand new 10.8V 5200mAh(6 cells) replacement HP Pavilion DV4-2165DX Li-ion battery is totally compatible with the original manufacturer's specifications. Through tested, all our Li-ion replacement batteries for HP Pavilion DV4-2165DX have been certified to meet and even exceed the original battery performance. Each replacement battery of the HP Pavilion DV4-2165DX laptop has been tested on the HP system before being dispatched to ensure the safety of your hp laptop