carfobbattery

Porsche 911 key fob battery

8 of the 31 model years listed for the Porsche 911 have a proven battery. The most common answer is CR2032. Rows below run oldest to newest; a year can appear twice when the car came with more than one kind of key.

  1. 1996Unknown

    Not confirmed yet

  2. 1997-2004Key-head remote

    Not confirmed yet

  3. 2005-2009Key-head remote

    Not confirmed yet

  4. 2010-2014Smart key

    CR2032

    FCC ID KR55WK50138

    Two sites agree: bestkeysupply.com and uhs-hardware.com (checked Nov 2, 2026)

    Find CR2032 on Amazon
  5. 2015-2016Smart key

    CR2032

    FCC ID KR55WK50138

    Two sites agree: bestkeysupply.com and abkeys.com (checked Nov 2, 2026)

    Find CR2032 on Amazon
  6. 2017Unknown

    Not confirmed yet

  7. 2018-2019Unknown

    Not confirmed yet

  8. 2020Unknown

    CR2032

    Owner's manual: manualslib.com (checked Nov 1, 2026)

    Manual text: “Changing the battery (CR 2032, 3V)”

    Find CR2032 on Amazon
  9. 2021-2026Unknown

    Not confirmed yet

Changing the battery

Smart key (push-button start)

  1. Find the small release on the edge or back of the fob and hold it while you pull out the metal emergency key.
  2. The gap left by the metal key usually has a pry point. A slow twist with a thin flat tool (tape on the tip saves the plastic) opens the two halves.
  3. Pop the old battery out with a toothpick or plastic pick, not a metal blade, and seat the new one with the + side matching the old one.
  4. Reassemble, refit the emergency key, and check that the car sees the fob when you press start.

A CR2032 is 20 mm across and 3.2 mm thick. CR2032, CR2025 and CR2016 share the same width but not the same thickness, so a swap between them can leave a loose contact or a case that will not close.

Remote key (form not stated in the source)

  1. The source for this row does not say which shape of key it is, so check your fob before you start.
  2. Look for a notch, slide or screw on the case. A coin or small flat screwdriver, twisted gently, opens most fobs.
  3. Replace the cell with the same side up, close the case, and test.

A CR2032 is 20 mm across and 3.2 mm thick. CR2032, CR2025 and CR2016 share the same width but not the same thickness, so a swap between them can leave a loose contact or a case that will not close.

If a child might have swallowed a coin cell, treat it as an emergency and get to a hospital right away.

Other Porsche models