Spec 12V 32Ah 12V 45Ah Voltage 12 Volts 12 Volts Capacity (Ah) 32 amp-hours 45 amp-hours Energy (Wh) ~384 Wh ~540 Wh Runtime Shorter runtime Longer runtime (about 40% more) Size / Weight 8.46″ × 4.53″ × 6.89″/ 27.23 lbs 10.24″ × 2.76″ × 6.69″/ 20.17 lbs The two battery models have different dimensions. Please check the battery model on your machine before making a purchase.