Get longer battery life and improved laptop performance with a new Lenovo ThinkPad T420s and T420si laptop battery.

This battery is made with the highest quality lithium-ion cells that charge faster and last longer than cheaper, lower quality batteries. Li-ion battery technology provides longer run times with less weight. In addition, Li-ion batteries are not subject to the memory effect common with older battery technology. This ThinkPad T420s battery is 100% compatible with the original battery specifications and is individually tested and backed by a 2 Year warranty.

THIS BATTERY ONLY WORKS WITH THE Lenovo T420s AND T420si. This battery will not work in the T430s or T430 models.

You can expect about 5 hours to 5-1/2 hours of run time with this T420s battery when new, depending on your energy use. If you are looking for even longer battery run times, check out our extended run battery for your Lenovo laptop.