AS09D31 is one of the most popular batteries which is now issued for the Acer Aspire Laptops. It is compatible with the latest Acer Laptop Models that includes Acer Aspire 3810 Timeline, Acer Aspire 4810, and Acer Aspire 5810. Now, the USBPHONEWORLD is able to provide this high quality compatible battery for these Acer Laptop models with a low price range, and we can guarantee our customers that our battery is 100% compatible with the Acer Laptops as well as meet or exceed the Original Battery's Specifications. Our AS09D31 battery is a 6-cell lithium ion battery with 11.1V and 4400mAh/49Wh capacity. With this battery, customers can enjoy the advantages of the newer battery technology and design. This battery will fit customers' laptop well and provide high quality performance. Plus, this battery is light and so easy to carry when the customers are travelling. For customer's convenience, USBPHONEWORLD offers the different shipping options which make sure that the customers reveice the battery on time as their requests. Furthermore, we also have a wonderful warranty plan: one year free warranty came with the battery and 3 years optional extended warranty with only $39.95.