Lenovo 5B10W51881 is an internal lithium-ion battery for replacing a laptop battery. Its matching model, L21M3P72, helps identify the specific part when checking the required replacement.
The battery is rated at 11.64 V and has an energy capacity of 51.5 Wh. Lenovo lists its weight as 194 g. These specifications describe the battery and help distinguish it from other Lenovo parts.
It is intended for installation inside a laptop that requires Lenovo 5B10W51881.