carfobbattery

Chrysler 300 key fob battery

17 of the 19 model years listed for the Chrysler 300 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. 2005-2008Key-head remote

    CR2032

    FCC ID KOBDT04A; OHT692427AA

    Two sites agree: uhs-hardware.com and carandtruckremotes.com (checked Nov 1, 2026)

    Find CR2032 on Amazon
  2. 2009Remote (separate)

    Not confirmed yet

  3. 2010Remote (separate)

    Not confirmed yet

  4. 2011Smart key

    CR2032

    FCC ID M3N-40821302

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

    Manual text: “The recommended replacement battery is one CR2032 battery.”

    Find CR2032 on Amazon
  5. 2012Smart key

    CR2032

    FCC ID M3N-40821302

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

    Find CR2032 on Amazon
  6. 2013Smart key

    CR2032

    FCC ID M3N-40821302

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

    Manual text: “The recommended replacement battery is one CR2032 battery.”

    Find CR2032 on Amazon
  7. 2014-2018Smart key

    CR2032

    FCC ID M3N-40821302

    Two sites agree: uhs-hardware.com and energizer.com (checked Nov 1, 2026)

    Find CR2032 on Amazon
  8. 2019-2023Smart key

    CR2032

    FCC ID M3N-40821302

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

    Find CR2032 on Amazon

Changing the battery

Key with remote in the head

  1. Here the key blade and remote are one piece. You open the plastic head, not the blade.
  2. Find the seam around the head. Twist a coin or small flat screwdriver in the notch at the blade end or side until the halves part.
  3. The coin cell is usually under or on the back of a small board. Keep the rubber button pad in place while you swap the cell.
  4. Snap it closed and press each button. The car still starts with a dead remote battery on most of these keys, because the start chip needs no battery.

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.

Smart key (push-button start)

  1. Most push-button fobs hide a metal backup key. Press or slide its catch and draw the key out first.
  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. Before you take the old cell out, look at its face. Put the new cell in with the same side showing, and avoid touching both faces at once.
  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.

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

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