This is the Extended Run version of the 57+ battery. This ThinkPad battery is physically larger than the standard 57+ battery. It will protrude under the laptop about 1 inch. If you have a docking station, this bottom protrusion will prevent you from plugging into the docking station. You will want to use the Lenovo standard size battery, 57+, when using a docking station.

This brand new Lenovo ThinkPad T440P T540P L540 L540P W540 battery features lithium-ion cells. This ThinkPad 57++ 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 4-5 hours of run time with this Lenovo 57++ battery when new, depending on your energy use.

This battery replaces the Lenovo T440P T540p L540p L540 W540 0C52864 series.