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Get Longer Battery Life and Improved Laptop Performance with this Original Dell Inspiron 15R 5521 Battery. This is a 6 Cell Lithium-ion Battery made by Dell which comes with 1 Year Hassle free Warranty from Dell. This Dell Inspiron 15R 5521 Battery has a Power Capacity of 65Wh which can last upto 4-5 Hours ( under normal use) without worrying about an AC Power source. If your Dell Inspiron 15R 5521 Laptop was shipped with a standard 40Wh Rechargeable Lithium-ion battery and you want to upgrade w..