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This is a Dell 312-9955 compatible 6-Cell Li-ion 10.8V 5200mAh 56Wh battery specifically designed for Dell notebooks. With up to 5200mAh and 56Wh of power you can rely upon long lasting power be it for work or play. Our batteries mimic the OEM form factor so they fit properly with your notebook. Batteries are 100% tested and compatible with the intended system. Battery life depends on many factors including: available DRAM, screen brightness, applications, features, power management, battery condition and other user preferences. With the certification test program, your product will work right the first time. The products are also guaranteed by federal law to not affect or void OEM warranties.