AS09D51, as one of the most popular batteries which is normally used for the Acer Aspire Laptops, now is issued as the compatible version by the USBPHONEWORLD. This AS09D51 battery is compatible with the many kinds of Acer Laptop Models that includes Acer Aspire 3810T series laptops, Acer Aspire 4810T series laptops, and Acer Aspire 5810T series laptops. The USBPHONEWORLD carry this brand new high-quality compatible battery for these Acer Laptop models with a better reasonable sale price, and we can guarantee our customers that our AS09D51 battery is 100% compatible with the Acer Laptops, and it also meet or exceed the Original Battery's Specifications in many areas. For the technology information, our AS09D51 battery is a 6-cell lithium ion battery with 11.1V and 4400mAh/49Wh capacity which can give users around two to three hours usage time. With this battery, customers can enjoy the advantages of the newer battery technology and design. This battery will fit customers' laptop well and offer high quality performance for the users. 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 can 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.