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Search all of iFixit forÂReplace a 4400 mAh external battery compatible with Lenovo ThinkPad T440/T440s/T450/X240/L450 laptops. Fix issues like a swollen or fast draining battery. 11.4 Volts (V). 24 Watt Hours (Wh). Battery Model #45N1108, 45N1109, 45N1110, 45N1111, 45N1773.