carfobbattery

Mercury Mountaineer key fob battery

Every model year listed for the Mercury Mountaineer has a proven battery. The most common answer is 2 x CR2016. Rows below run oldest to newest; a year can appear twice when the car came with more than one kind of key.

  1. 1997Remote (separate)

    2 x CR2016

    FCC ID GQ43VT4T

    Two sites agree: keylessentryremotefob.com and carandtruckremotes.com (checked Nov 1, 2026)

    Find CR2016 on Amazon
  2. 1998-2010Remote (separate)

    CR2032

    FCC ID CWTWB1U331 / CWTWB1U345 / CWTWB1U311

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

    Find CR2032 on Amazon

Changing the battery

Separate remote fob

  1. The remote is a small standalone unit. You will not need to touch the ignition key at all.
  2. Find the slot along the edge and turn a coin in it. Go slowly so the clips do not snap.
  3. Replace the cell, keeping the + side where it was, and check the small metal tab still touches it.
  4. Snap the case shut and watch for the lights to flash when you press lock at the car.

This key takes two CR2016 cells. Change both at the same time and stack them the way the old pair sat; mixing a fresh cell with a tired one shortens the life of the new one.

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.

Coin cells are a choking and burn hazard for children. Store the spares in their original pack, out of reach.

Other Mercury models