Several of Acer’s inexpensive 11.6 inch notebooks use the same batter. The Acer Aspire One 756, Acer TravelMate B113, and Acer Aspire V5-171 Windows laptops and the Acer C7 Chromebook all have the same 3-cell battery and typically offer between 3 and 4 hours of battery life.
But if you pick up a 3rd party 6-cell battery you can get about twice as much run time.
Liliputing reader WANg wrote in to let us know that you can use a Sanyo AL12X32 5000mAh battery in any of these laptops and get around 7 hours of battery life.
In some parts of the globe Acer also offers some of these laptops with higher-capacity batteries, but in the US it tends to position these notebooks as low-cost devices and only offers the 3-cell, 2500mAh battery option in order to keep prices low (and presumably to convince customers who want longer battery life to spend more money on higher-end notebooks).
Bear in mind, the extended battery is bigger and heavier than the 3-cell battery, so it’ll make these portable notebooks slightly bulkier. But that may be a small price to pay for the ability to fly from one coast of the US to the other and use your notebook without recharging it.