The Lenovo 5B11M90071 is an internal lithium-ion replacement battery for selected Lenovo laptop configurations. Its four-cell design and stated 54.7 Wh capacity identify the battery for shoppers checking a compatible replacement.
The battery model is L20D4P73, with a listed voltage of 15.36 V. The detailed description and specification table also state 55 Wh, while the product title gives 54.7 Wh.
The listing does not name specific laptop models, so compatibility depends on the laptop configuration.