The 7.4 volt, 6520 mAh battery in the UX32VD weighs 280.5 grams, accounting for approximately 20% of the Zenbook's weight.

By comparison, the battery in the 13" MacBook Air is approximately 22% of the Air's total weight, at 300 grams.

This Zenbook sports a 48 watt-hour battery, a smaller battery than the previous year's model, but a solid contender with other similarly-sized laptops.

2011 Zenbook UX31A: 50 watt-hours

Macbook Air: 50 watt-hours

Acer Aspire S5: 34 watt-hours