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312-0748-AA is a Dell compatible 6-Cell LI-ION 11.1V 5200 mAh battery specifically designed for Dell notebooks. This higher capacity 5200 mAh battery packs more punch than the OEM and has a similar form factor to the OEM. These 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.