This is a new battery for the Lenovo IdeaPad U450P and U550 models. This battery is rated 11.1 volts and 5200 mAh and will typically last 2-3 hours on a full charge. You can get longer battery life by dimming your screen and closing unused programs.

This battery replaces the original battery found in IdeaPad U450P, U550 as well as the 57Y6309 battery part number. Additional compatible battery part numbers are listed below.

This IdeaPad U550 battery is 100% compatible with the original Lenovo battery specifications and is individually tested and backed by a 2 Year warranty.

You can expect about 2 hours to 3 hours of run time with this Lenovo u550 battery when new, depending on your energy use.