This brand new Lenovo ThinkPad T420 series battery features the highest quality lithium-ion cells on the market. You can expect about 5 hours of run time with this battery when fully charged.
This battery replaces the for Lenovo ThinkPad T420, T420i, 42T4795, and 42T4794 models and part numbers as well as many more listed below.
Li-ion batteries are not subject to the memory effect common with older battery technology. This ThinkPad T420 battery is 100% compatible with the original battery specifications and is individually tested and backed by a 2 Year warranty.