Over time, the battery of your laptop will last less and less, which becomes obvious if you take it outside the home to do work on it. Eventually you may even have to keep it plugged in all the time because the battery drains so quickly. Although some people may feel inclined to throw away their laptop, the solution is very simple. Simply purchase a replacement laptop battery such as this one to once again get the battery performance you were used to when the laptop was new. For the most part, laptop batteries are easy to remove and therefore easy to replace. Pop the old one out and the new one in. This battery is compatible with various HP EliteBooks and has 8 cells.