Since 1965 Lenmar has been building award winning, high quality power related products. Lenmar personally manages the excellence of our products through every aspect from design to production. Fits: IBM ThinkPad X300 Series, X301 Series, Reserve Edition 8748 Replaces: IBM 43R1965, ASM 42T4519, FRU 42T4518 Specifications: •Voltage: 10.8V •Capacity: 4000mAh •Chemistry: Lithium Ion •Warranty: 1 Year Warranty