The Lenovo 01AV478 is an internal rechargeable lithium-ion battery for the ThinkPad T480s. Lenovo also identifies this part as ASM SB10K97620 and battery model L17L3P71, useful designations when checking the replacement variant.
Its 3 cells provide a rated energy capacity of 57 Wh. The listed battery voltage is 11.58 V and cell voltage is 3.86 V. LGC is the supplier of the battery assembly.
At a listed weight of 240 g, the battery installs inside the notebook rather than serving as an external power pack. It is intended as an internal replacement for the Lenovo ThinkPad T480s. The ASM number and battery model help distinguish this 57 Wh version from other Lenovo variants.