Are you worrying about the short standby time of your laptop? Look at this battery with 6 cells 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. It is good choice for your laptop during using especially when you are outdoors.                                    Features            You can get long hours of battery life without having to frequently plug into recharge with itNo memory effect. Chargeable even if it has not been used up yetUsing advanced cell technology and quality parts, it guarantees the stamina to meet your need of long work sessions and travelManufactured to the highest quality available with true enhanced performancePowered by high quality cellsCan be charged while it is installed and the computer is connected to AC power                                                             Specifications            Dimensions    10.55 x 1.85 x 0.79" / 26.8 x 4.7 x 2 cm (L x W x H)    <br>Weight    4.3 oz / 122 g    <br>Color    Black    <br>Capacity    5200mAH    <br>Voltage    10.8V    <br>Cell    6 Cell    <br>Compatible with    587706-131，587706-221，587706-241，587706-251587706-421，587706-541，587706-741，587706-751587706-761，593572-001，BQ350AA，BQ350AA#ABAHSTNN-CB1A，HSTNN-DB1A，HSTNN-DB1B，HSTNN-W79C-5HSTNN-I85C，HSTNN-I85C-3，HSTNN-I85C-4，HSTNN-I85C-5HSTNN-I86C，HSTNN-I86C-3，HSTNN-I86C-4，HSTNN-I86C-5HSTNN-IB1A，HSTNN-LB1A，HSTNN-Q78C，HSTNN-Q78C-3HSTNN-Q78C-4，HSTNN-Q81C，HSTNN-Q81C-3，HSTNN-Q81C-4HSTNN-W79C，HSTNN-W79C-5，HSTNN-W79C-7，HSTNN-W80CHSTNN-XB1A，HSTNN-XB1B，PH06，PH06047PH06047-CL，587706-121，587706-751，587706-761593572-001，BQ350AA，HSTNN-CB1A，HSTNN-CBOXHSTNN-DB1A，HSTNN-Q78C，HSTNN-Q78C-3，HSTNN-Q78C-4HSTNN-Q81C，HSTNN-UB1A    <br>Compatible with    COMPAQ:Compaq 320，Compaq 321，Compaq 325，Compaq 326，Compaq 420，Compaq 421<br>Compaq 425，Compaq 525，Compaq 620，Compaq 621，Compaq 625 <br>HP:HP 420，HP 421，HP 425，HP 4320t，HP 620，HP 625<br>ProBook 4320s，ProBook 4321s，ProBook 4325s，ProBook 4326s<br>ProBook 4420s，ProBook 4421s，ProBook 4425s，ProBook 4520s<br>ProBook 4525s，ProBook 4720s    <br>                                                            Package Includes            1 x Battery<br>