Get longer battery life and improved laptop performance with a new 57Y4186 battery for the Lenovo ThinkPad T430s and T420s.

This Lenovo 57Y4186 battery is only compatible with the Lenovo ThinkPad T420s and T430s laptop models.

This battery IS NOT COMPATIBLE with the Lenovo ThinkPad T420 or T430. (The small "s" is very important on your model number.)

We use the highest quality lithium-ion battery technology that provides longer run times with less weight. This 57Y4186 battery replacement is 100% compatible with the original battery specifications and is individually tested and backed by a 2 year warranty.

You can expect about 3 hours to 5 hours of run time with this Lenovo 57Y4186 battery when new. You can get even longer battery run time by dimming your screen and closing unused programs.