Mazda B-Series key fob battery
2 of the 15 model years listed for the Mazda B-Series 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.
- 1996-1997Unknown
Not confirmed yet
- 1998Remote (separate)
Not confirmed yet
- 1999Remote (separate)
CR2032
FCC ID CWTWB1U331 / CWTWB1U345Two sites agree: americankeysupply.com and remotesandkeys.com (checked Nov 1, 2026)
Find CR2032 on Amazon - 2000Remote (separate)
Not confirmed yet
- 2001-2007Remote (separate)
Not confirmed yet
- 2008Remote (separate)
CR2032
Owner's manual: manualsdir.com and americankeysupply.com (checked Nov 1, 2026)
Manual text: “coin type three-volt lithium battery CR2032 or equivalent”
Find CR2032 on Amazon - 2009Remote (separate)
Not confirmed yet
- 2010Remote (separate)
Not confirmed yet
Changing the battery
Separate remote fob
- The remote is a small standalone unit. You will not need to touch the ignition key at all.
- Turn it over: some older fobs use one small screw, newer ones just clip. Pry at the seam once any screw is out.
- Lift the old coin cell out and press the new one in with matching orientation.
- Snap the case shut and watch for the lights to flash when you press lock at the car.
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.