On our notebook configurator there is sometimes the option of upgrading your battery or ordering additional batteries. The length of time a laptop battery will operate varies on individual notebook computers, based on the applications being used (i.e. high end graphics, gaming), the number of times something is saved or retrieved from the hard drive, how often the CD/DVD drive is used, and the amount of memory in the notebook. The realistic average run-time is 1.5 to 3 hours, but obviously the more you use the notebook, and the more devices you order when configuring the notebook, the lower the battery life will be. Using devices like a wireless adapter will also reduce the battery life.
Same as standard battery.