The Lenovo 5B11K38526 is an internal laptop battery for powering a compatible notebook when it is unplugged. Lenovo documentation identifies it by FRU 5B11K38526 and battery model L22M4PA0.
It has four cells and uses Li-Polymer technology. The rated capacity is 3890 mAh / 60 Wh, with an output voltage of 15.44 V.
Listed compatible models are Lenovo Legion Slim 5-16IRH8 (82YA), IdeaPad 1 15IAU7 (82QD/82VY), LOQ 15IRH8 (82XV), LOQ 16APH8 (82XU), LOQ 16IRH8 (82XW), LOQ 15APH8 (82XT), and Legion Slim 5-16APH8 (82Y9).