About this replacement
Designed for Lenovo devices. Compatible models include IdeaPad U450A, IdeaPad U450P, IdeaPad U450, IdeaPad U550, IdeaPad U550A. Replacement part numbers include L09S8D21, L09L8D21, L09L4B21, L09S4B21. Key specifications: 14.4V, 4400mAh, Li-ion.