Lenmar Replacement Battery for Lenovo-IBM ThinkPad X200 X200s Series Replaces OEM Lenovo-IBM 43R9254 FRU 42T4536 FRU 42T4538 Fits: Lenovo-IBM ThinkPad X200, X200s Series Replaces: Lenovo-IBM 43R9254, FRU 42T4536, FRU 42T4538 10.8V 4400mAh Lithium Ion 1 Year Warranty Fits: Lenovo-IBM ThinkPad X200, X200s Series Replaces: Lenovo-IBM 43R9254, FRU 42T4536, FRU 42T4538 10.8V / 4400mAh Lithium Ion 1 Year Warranty