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NJNF battery is an internal lithium-ion power source designed for specific Dell Inspiron Ultrabook models. It is known for its compact design and is a direct replacement for several other part numbers.Information and DescriptionProduct Type: This is a genuine or compatible internal, rechargeable lithium-ion (Li-ion) battery. Unlike external batteries, this type requires the laptop chassis to be opened for installation.Part Numbers: The primary part number is 2NJNF. Other compatible part numbers include:8JVDGTPMCFT41M0Technical Specifications:Voltage: The most common voltage is 11.1V, although some sources may list 14.8V. Both are associated with the same Watt-hour capacity, so it's critical to verify the voltage of your old battery before purchasing a new one to ensure proper compatibility.Watt-hour (Wh) Capacity: The standard capacity for this battery is 44Wh.Milliampere-hour (mAh) Capacity: The mAh capacity is typically 3700 mAh or 3960 mAh.Number of Cells: This is a 6-cell battery.