This Lenovo 45N1037 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.)
This Lenovo 45N1037 battery uses the highest quality lithium-ion battery technology that provides longer run times with less weight. Lower quality batteries found on eBay and Amazon have high defection rates and prone to wearing out in just a few months. Our quality batteries can last up to 5 years if properly take care of.
This 45N1037 battery is 100% compatible with the original Lenovo battery specifications and is individually tested and backed by a 2 year warranty.