AddOn Part #312-0823-AA is a Dell compatible LI-ION 6-CELL 11.1V 5200MAH NOTEBOOK BATTERY for Dell Latitude portable computers. This higher-capacity 5200mAh Battery packs more punch than the OEM. It has a similar form factor to the OEM and is made specifically for the Dell Latitude E4300 series of portable computers. AddOn batteries are 100% tested and compatible for the systems intended for. Battery life depends on many factors including: available DRAM, screen brightness, applications, features, power management, battery condition and other customer preferences. AddOn part numbers mimic the OEM, and are comparable in form factor and battery life.