Mazda 3 Car Key Battery – Type, Size, Compatibility & Pricing Guide
If your Mazda 3 car key battery is starting to fail, the key fob may stop locking the doors, the engine might not detect the signal, or you may see a “Key Battery Low” warning on the dashboard. This guide explains exactly what battery your Mazda 3 uses, how sizes differ by model year, and how to choose the right replacement for your key fob.
Whether you drive a sedan or a Mazda 3 hatchback, the process is the same—only the battery type and size change depending on the generation.
What Battery Does a Mazda 3 Key Fob Take?
The correct battery for a Mazda 3 key fob depends on the model year and key type:
- 2004–2013 Mazda 3 (Flip Key) → CR2025
- 2019–2024 Mazda 3 Advanced / Proximity Key → CR2032
These are the three battery types Mazda has consistently used across all generations. If you’re wondering “What battery does a Mazda 3 key fob take?”—this table covers every variation.
| Model / Year | Generation | Key style | Battery type | Notes |
|---|---|---|---|---|
| Mazda 3 2004 | Gen 1 | Flip key | CR1620 | Classic flip key with a simple internal layout and easy access to the battery compartment |
| Mazda 3 2005 | Gen 1 | Flip key | CR1620 | Classic flip key with a simple internal layout and easy access to the battery compartment |
| Mazda 3 2006 | Gen 1 | Flip key | CR1620 | Classic flip key with a simple internal layout and easy access to the battery compartment |
| Mazda 3 2007 | Gen 1 | Flip key | CR1620 | Classic flip key with a simple internal layout and easy access to the battery compartment |
| Mazda 3 2008 | Gen 1 | Flip key | CR1620 | Classic flip key with a simple internal layout and easy access to the battery compartment |
| Mazda 3 2009 | Gen 1 | Flip key | CR1620 | Classic flip key with a simple internal layout and easy access to the battery compartment |
| Mazda 3 2010 | Gen 2 | Smart key | CR2025 | Smart fob that opens using the mechanical key release and has a straightforward internal structure |
| Mazda 3 2011 | Gen 2 | Smart key | CR2025 | Smart fob that opens using the mechanical key release and has a straightforward internal structure |
| Mazda 3 2012 | Gen 2 | Smart key | CR2025 | Smart fob that opens using the mechanical key release and has a straightforward internal structure |
| Mazda 3 2013 | Gen 2 | Smart key | CR2025 | Smart fob that opens using the mechanical key release and has a straightforward internal structure |
| Mazda 3 2014 | Gen 3 | Smart key | CR2025 | Two piece smart fob with a side notch and a well organized internal layout for easy handling |
| Mazda 3 2015 | Gen 3 | Smart key | CR2025 | Two piece smart fob with a side notch and a well organized internal layout for easy handling |
| Mazda 3 2016 | Gen 3 | Smart key | CR2025 | Two piece smart fob with a side notch and a well organized internal layout for easy handling |
| Mazda 3 2017 | Gen 3 | Smart key | CR2025 | Two piece smart fob with a side notch and a well organized internal layout for easy handling |
| Mazda 3 2018 | Gen 3 | Smart key | CR2025 | Two piece smart fob with a side notch and a well organized internal layout for easy handling |
| Mazda 3 2019 | Gen 4 | Proximity key | CR2032 | Modern proximity fob designed for stable signal performance and quick access to the battery tray |
| Mazda 3 2020 | Gen 4 | Proximity key | CR2032 | Modern proximity fob designed for stable signal performance and quick access to the battery tray |
| Mazda 3 2021 | Gen 4 | Proximity key | CR2032 | Modern proximity fob designed for stable signal performance and quick access to the battery tray |
| Mazda 3 2022 | Gen 4 | Proximity key | CR2032 | Modern proximity fob designed for stable signal performance and quick access to the battery tray |
| Mazda 3 2023 | Gen 4 | Proximity key | CR2032 | Modern proximity fob designed for stable signal performance and quick access to the battery tray |
| Mazda 3 2024 | Gen 4 | Proximity key | CR2032 | Modern proximity fob designed for stable signal performance and quick access to the battery tray |
| Mazda 3 2025 | Gen 4 | Proximity key | CR2032 | Modern proximity fob designed for stable signal performance and quick access to the battery tray |
Mazda 3 Key Fob Battery Type (By Year)
If your Mazda 3 key battery is dead, replacing it with the correct size is all you need—no reprogramming required unless the key fob is damaged.
Mazda 3 Car Key Battery Size
Mazda uses different battery sizes depending on the generation:
- CR2025 – used in older flip keys
- CR2032 – thicker, longer-lasting option for modern proximity keys
If you’re searching for Mazda 3 key fob battery size, use this simple rule:
Pre-2013 models → CR2025
2013+ models → CR2032
Signs Your Mazda 3 Key Fob Battery Is Dying
A weak or dead key fob battery usually shows these symptoms:
- Reduced range when locking/unlocking
- “Key Not Detected” or “Key Battery Low” messages
- The push-button start doesn’t respond immediately
- Inconsistent response when pressing buttons
If your Mazda 3 battery key fob stops working entirely, the internal coin battery is almost always the cause.
Mazda 3 Car Key Battery Price
Good news: the battery itself is very cheap.
Typical pricing:
- CR2025 → $2–$5
- CR2032 → $2–$6
Premium brands like Panasonic, Duracell, and Energizer may cost a little more but usually last longer.
Full service pricing:
- DIY battery replacement: $2–$6 (just the battery)
- Locksmith key fob battery replacement: $10–$25
- Dealership battery replacement: $30–$60
If you’re looking to buy one online, search for Mazda 3 car key battery buy or simply choose a high-quality CR battery on Amazon or Walmart.
Where to Buy a Mazda 3 Key Fob Battery
You can purchase a replacement battery for any Mazda 3 key fob here:
- Amazon
- Walmart
- AutoZone
- O’Reilly Auto Parts
- Target
Just make sure the product name matches your exact battery type (CR2025, or CR2032).
Mazda 3 – OEM key fob part numbers
For the Mazda 3, the key fob battery itself does not have a Mazda OEM number, because it is a standard coin cell (CR2025 or CR2032, depending on model year). OEM part numbers apply to the complete smart key fob assembly, not to the battery.
Typical OEM smart key part numbers for the Mazda 3 by generation include:
- 2010-2012 Mazda 3 smart key – part number BBY2-67-5RY
- 2014-2018 Mazda 3 smart key – part number GJY9-67-5DY, FCC ID WAZSKE13D01 or WAZSKE13D02
- 2014-2018 Mazda 3 smart key variants – part numbers KDY3-67-5DY and KD33-67-5RY also used on some Mazda 3 trims
- 2019-2024 Mazda 3 sedan and hatchback smart key – part number BCYA-67-5DYB (genuine Mazda OEM smart key)
All of these Mazda 3 OEM smart keys use a standard 3V coin battery inside the fob. For most modern Mazda 3 smart keys that you see on 2014+ cars, that is a CR2032 battery.
Mazda 3 Key Battery – Final Notes
Whether you own a 2011 model, a 2012 hatchback, or the latest Mazda 3, replacing the key fob battery is simple and inexpensive. The important part is choosing the correct Mazda 3 key fob battery type and ensuring the battery size matches your generation.
If you already know your key isn’t responding, the safest move is to replace the battery first—most “key not detected” issues come from a weak coin cell.