We are glad to recommend you this battery which is compatible with HP Probook 4320s 4321s 4325s 4520s 4525s. It will certainly make your laptop regain energy by the use of the high capacity battery. It provides you with the strong battery life, which is great to solve the problems of the short-term use life and poor performance. The standby time of laptop battery is determined mainly by the mAh. Under normal circumstances, the more cells decide the greater mAh, which provides longer standby time. With 9 cells, this battery will satisfy your demand. Made with fine workmanship and by strict examination, this battery is up to standard that you could use it trustingly.It must be the bestchoice!                                    Features               <br>
 You can get long hours of battery life without having to frequently plug into recharge with it<br>
 No memory effect, which can be charged even if it has not been used up yet<br>
 Using advanced cell technology and quality parts, it guarantees the stamina to meet your need of long work sessions and travel<br>
 Manufactured to the highest quality available with true enhanced performance<br>
 Powered by high quality cells<br>
 Can be charged while it is installed and the computer is connected to AC power  <br>
                                                            Specifications             Dimensions     (10.55 x 1.69 x 1.42)" / (26.8 x 4.3 x 3.6)cm (L x W x H)    <br>
 Weight     18.31oz / 519g    <br>
 Color     Black    <br>
 Capacity     7800mA    <br>
 Voltage     10.8V    <br>
 Cell     9 Cell    <br>
 Compatible with     HP ProBook 4320s 4321s 4325s 4520s 4525s     <br>
                                                             Package Includes            1 x Battery<br>
1 x User Manual<br>