Lenovo battery 5B10W51859 is an internal replacement power source for compatible Lenovo notebooks. Its exact part number identifies a three-cell battery for installation inside a laptop, rather than use as an external power bank.
With a stated capacity of 41 Wh, it provides portable power in a compatible notebook. Replacing a battery that needs changing can restore the notebook’s mobile use.
The retailer lists some Lenovo ThinkPad X13 Gen 2 configurations as potentially compatible, including 20WK001UMS and 20XH008WMH. Check that the notebook configuration is compatible before choosing this battery.