The Lenovo 5B11N51729 is an internal Li-polymer laptop battery, associated in Lenovo documentation with battery model L21B4PD0.
Its four-cell design is listed with 15.52 V output and a capacity of 3608 mAh / 56 Wh by the distributor. Lenovo documentation also lists 15.52 V and 54.7 Wh for this part number. Listed compatible models are ThinkBook 13x IAP G2 (21AT), ThinkBook 13s G4 IAP (21AR/21AS), and ThinkBook Plus G4 IRU (21JJ).
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