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Dell Inspiron 3521 CMOS Battery Replacement

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Access the motherboard to replace the CMOS battery if your computer is having issues tracking the date and time. It is recommended to wear an anti-static wrist strap to avoid damaging the electronic components of the computer.

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  1. Dell Inspiron 3521 CMOS Battery Replacement, Remove the Battery: crwdns2935265:01crwdnd2935265:01crwdnd2935265:03crwdne2935265:0 Dell Inspiron 3521 CMOS Battery Replacement, Remove the Battery: crwdns2935265:01crwdnd2935265:02crwdnd2935265:03crwdne2935265:0 Dell Inspiron 3521 CMOS Battery Replacement, Remove the Battery: crwdns2935265:01crwdnd2935265:03crwdnd2935265:03crwdne2935265:0

    • Make sure laptop is turned off and unplugged.

    • Turn over the laptop, and push in the clips to take out the battery.

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  2. Dell Inspiron 3521 CMOS Battery Replacement, Remove Surface Cover: crwdns2935265:02crwdnd2935265:01crwdnd2935265:03crwdne2935265:0 Dell Inspiron 3521 CMOS Battery Replacement, Remove Surface Cover: crwdns2935265:02crwdnd2935265:02crwdnd2935265:03crwdne2935265:0 Dell Inspiron 3521 CMOS Battery Replacement, Remove Surface Cover: crwdns2935265:02crwdnd2935265:03crwdnd2935265:03crwdne2935265:0

    • Remove the screws to take off the surface cover.

    • Make sure to keep small screws organized in Step 2 and all subsequent steps to make reassembly easier.

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  3. Dell Inspiron 3521 CMOS Battery Replacement, Remove Hard Drive: crwdns2935265:03crwdnd2935265:01crwdnd2935265:03crwdne2935265:0 Dell Inspiron 3521 CMOS Battery Replacement, Remove Hard Drive: crwdns2935265:03crwdnd2935265:02crwdnd2935265:03crwdne2935265:0 Dell Inspiron 3521 CMOS Battery Replacement, Remove Hard Drive: crwdns2935265:03crwdnd2935265:03crwdnd2935265:03crwdne2935265:0

    • Remove screws securing the hard drive

    • Remove hard drive by pulling on the tab to slide it out.

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  4. Dell Inspiron 3521 CMOS Battery Replacement, Remove Memory Card: crwdns2935265:04crwdnd2935265:01crwdnd2935265:03crwdne2935265:0 Dell Inspiron 3521 CMOS Battery Replacement, Remove Memory Card: crwdns2935265:04crwdnd2935265:02crwdnd2935265:03crwdne2935265:0 Dell Inspiron 3521 CMOS Battery Replacement, Remove Memory Card: crwdns2935265:04crwdnd2935265:03crwdnd2935265:03crwdne2935265:0

    • Remove the memory card by pressing on the latches on either side.

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  5. Dell Inspiron 3521 CMOS Battery Replacement, Remove Optical Drive: crwdns2935265:05crwdnd2935265:01crwdnd2935265:02crwdne2935265:0 Dell Inspiron 3521 CMOS Battery Replacement, Remove Optical Drive: crwdns2935265:05crwdnd2935265:02crwdnd2935265:02crwdne2935265:0

    • Remove the screws securing the optical drive, then slide out the optical drive.

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  6. Dell Inspiron 3521 CMOS Battery Replacement, Remove All Screws on the Back: crwdns2935265:06crwdnd2935265:01crwdnd2935265:01crwdne2935265:0

    • Remove all remaining screws on the back.

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  7. Dell Inspiron 3521 CMOS Battery Replacement, Remove Keyboard: crwdns2935265:07crwdnd2935265:01crwdnd2935265:03crwdne2935265:0 Dell Inspiron 3521 CMOS Battery Replacement, Remove Keyboard: crwdns2935265:07crwdnd2935265:02crwdnd2935265:03crwdne2935265:0 Dell Inspiron 3521 CMOS Battery Replacement, Remove Keyboard: crwdns2935265:07crwdnd2935265:03crwdnd2935265:03crwdne2935265:0

    • Turn computer over and open it.

    • Carefully pry off keyboard using spudger.

    • Be careful not to damage ribbon cable while removing the keyboard.

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  9. Dell Inspiron 3521 CMOS Battery Replacement, Disconnect Ribbon Cable: crwdns2935265:08crwdnd2935265:01crwdnd2935265:03crwdne2935265:0 Dell Inspiron 3521 CMOS Battery Replacement, Disconnect Ribbon Cable: crwdns2935265:08crwdnd2935265:02crwdnd2935265:03crwdne2935265:0 Dell Inspiron 3521 CMOS Battery Replacement, Disconnect Ribbon Cable: crwdns2935265:08crwdnd2935265:03crwdnd2935265:03crwdne2935265:0

    • Remove the ribbon cable by pulling up on the tab where it is attached, then slide it out.

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  10. Dell Inspiron 3521 CMOS Battery Replacement, Unplug Smaller Ribbon Cable: crwdns2935265:09crwdnd2935265:01crwdnd2935265:03crwdne2935265:0 Dell Inspiron 3521 CMOS Battery Replacement, Unplug Smaller Ribbon Cable: crwdns2935265:09crwdnd2935265:02crwdnd2935265:03crwdne2935265:0 Dell Inspiron 3521 CMOS Battery Replacement, Unplug Smaller Ribbon Cable: crwdns2935265:09crwdnd2935265:03crwdnd2935265:03crwdne2935265:0

    • Unplug the smaller ribbon cable by pulling up on the tab where it is attached, then slide it out.

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  11. Dell Inspiron 3521 CMOS Battery Replacement, Unplug Motherboard Cable: crwdns2935265:010crwdnd2935265:01crwdnd2935265:03crwdne2935265:0 Dell Inspiron 3521 CMOS Battery Replacement, Unplug Motherboard Cable: crwdns2935265:010crwdnd2935265:02crwdnd2935265:03crwdne2935265:0 Dell Inspiron 3521 CMOS Battery Replacement, Unplug Motherboard Cable: crwdns2935265:010crwdnd2935265:03crwdnd2935265:03crwdne2935265:0

    • Unplug the motherboard cable by pulling up on the tab where it is attached, then slide it out.

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  12. Dell Inspiron 3521 CMOS Battery Replacement, Remove All Screws from Palm Rest: crwdns2935265:011crwdnd2935265:01crwdnd2935265:01crwdne2935265:0

    • Remove all screws from palm rest

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  13. Dell Inspiron 3521 CMOS Battery Replacement, Remove Palm Rest: crwdns2935265:012crwdnd2935265:01crwdnd2935265:03crwdne2935265:0 Dell Inspiron 3521 CMOS Battery Replacement, Remove Palm Rest: crwdns2935265:012crwdnd2935265:02crwdnd2935265:03crwdne2935265:0 Dell Inspiron 3521 CMOS Battery Replacement, Remove Palm Rest: crwdns2935265:012crwdnd2935265:03crwdnd2935265:03crwdne2935265:0

    • Remove palm rest by carefully prying it off with a spudger.

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  14. Dell Inspiron 3521 CMOS Battery Replacement, Unplug White Ribbon Cable: crwdns2935265:013crwdnd2935265:01crwdnd2935265:02crwdne2935265:0 Dell Inspiron 3521 CMOS Battery Replacement, Unplug White Ribbon Cable: crwdns2935265:013crwdnd2935265:02crwdnd2935265:02crwdne2935265:0

    • Unplug the white ribbon cable by pulling up on the tab where it is attached, then slide it out.

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  15. Dell Inspiron 3521 CMOS Battery Replacement, Remove Connecting Cable: crwdns2935265:014crwdnd2935265:01crwdnd2935265:03crwdne2935265:0 Dell Inspiron 3521 CMOS Battery Replacement, Remove Connecting Cable: crwdns2935265:014crwdnd2935265:02crwdnd2935265:03crwdne2935265:0 Dell Inspiron 3521 CMOS Battery Replacement, Remove Connecting Cable: crwdns2935265:014crwdnd2935265:03crwdnd2935265:03crwdne2935265:0

    • Gently pull out the connecting cable.

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  16. Dell Inspiron 3521 CMOS Battery Replacement, Unplug the Black and White Cables from Wi-Fi Chip: crwdns2935265:015crwdnd2935265:01crwdnd2935265:02crwdne2935265:0 Dell Inspiron 3521 CMOS Battery Replacement, Unplug the Black and White Cables from Wi-Fi Chip: crwdns2935265:015crwdnd2935265:02crwdnd2935265:02crwdne2935265:0

    • Unplug the black and white cables connected to the Wi-Fi chip.

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  17. Dell Inspiron 3521 CMOS Battery Replacement, Remove Screen: crwdns2935265:016crwdnd2935265:01crwdnd2935265:02crwdne2935265:0 Dell Inspiron 3521 CMOS Battery Replacement, Remove Screen: crwdns2935265:016crwdnd2935265:02crwdnd2935265:02crwdne2935265:0

    • Disconnect screen by removing all remaining screws.

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  18. Dell Inspiron 3521 CMOS Battery Replacement, Remove Wi-Fi Chip: crwdns2935265:017crwdnd2935265:01crwdnd2935265:02crwdne2935265:0 Dell Inspiron 3521 CMOS Battery Replacement, Remove Wi-Fi Chip: crwdns2935265:017crwdnd2935265:02crwdnd2935265:02crwdne2935265:0

    • Remove screws securing the Wi-Fi chip, then remove Wi-Fi chip.

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  19. Dell Inspiron 3521 CMOS Battery Replacement, Unplug Connecting Cables on Motherboard: crwdns2935265:018crwdnd2935265:01crwdnd2935265:02crwdne2935265:0 Dell Inspiron 3521 CMOS Battery Replacement, Unplug Connecting Cables on Motherboard: crwdns2935265:018crwdnd2935265:02crwdnd2935265:02crwdne2935265:0

    • Locate and disconnect connecting cables on motherboard.

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  20. Dell Inspiron 3521 CMOS Battery Replacement, Remove Motherboard: crwdns2935265:019crwdnd2935265:01crwdnd2935265:02crwdne2935265:0 Dell Inspiron 3521 CMOS Battery Replacement, Remove Motherboard: crwdns2935265:019crwdnd2935265:02crwdnd2935265:02crwdne2935265:0

    • Remove the remaining screws securing the motherboard to remove it.

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  21. Dell Inspiron 3521 CMOS Battery Replacement, Remove CMOS Battery: crwdns2935265:020crwdnd2935265:01crwdnd2935265:03crwdne2935265:0 Dell Inspiron 3521 CMOS Battery Replacement, Remove CMOS Battery: crwdns2935265:020crwdnd2935265:02crwdnd2935265:03crwdne2935265:0 Dell Inspiron 3521 CMOS Battery Replacement, Remove CMOS Battery: crwdns2935265:020crwdnd2935265:03crwdnd2935265:03crwdne2935265:0

    • Flip over motherboard and locate CMOS battery

    • Pry off battery with spudger.

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  22. Dell Inspiron 3521 CMOS Battery Replacement, Replace CMOS Battery: crwdns2935265:021crwdnd2935265:01crwdnd2935265:02crwdne2935265:0 Dell Inspiron 3521 CMOS Battery Replacement, Replace CMOS Battery: crwdns2935265:021crwdnd2935265:02crwdnd2935265:02crwdne2935265:0

    • Place new CMOS battery in motherboard.

    • Repeat all steps backwards to reassemble computer.

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To reassemble your device, follow these instructions in reverse order.

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Victoria Rivera

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Dont wast you time for these steps because this model 3521 ,only 2nd step enough for remove cmos battery . Once remove the Surface Cover ,you can see the cmos battery .. no need to remove all the components .thanks me later .

Stuff Srilanka - crwdns2934203:0crwdne2934203:0

Thank you, kind man)

Александр Кашенцев -

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