Mazda 6 Key Fob Battery Replacement: Deluxe CR2032
The Deluxe CR2032 is a two-pack of 3V lithium coin batteries sold for Mazda key fobs. A standard CR2032 is 20mm wide and 3.2mm thick. It fits Mazda6 keys that call for a CR2032, such as the 2021 key and the 2020 Type B key. Some Mazda6 keys need a CR2025 instead, so check your key first.
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Will This Battery Work in Your Mazda6 Key?
It depends on your key. Mazda’s U.S. owner’s manuals list CR2025 for the 2019 Mazda6 and the 2020 Type A key, and CR2032 for the 2020 Type B key and the 2021 Mazda6. Run this quick check before you buy.
A CR2025 and a CR2032 are both 3V and 20mm wide, but the CR2032 is 3.2mm thick and the CR2025 is 2.5mm thick. Mazda says to replace the battery with the same type, which rules out swapping one for the other. This guide covers the 2019–2021 U.S. manuals only. For an older Mazda6, check your own key and owner’s manual.
Deluxe CR2032 Specifications
| Property | Detail |
|---|---|
| Brand | Deluxe Batteries |
| Product | Key Fob Replacement Batteries for Mazda |
| Battery type | CR2032 |
| Pack size | 2 cells |
| Nominal voltage | 3 V |
| Chemistry (standard CR2032) | Lithium / manganese dioxide (Li/MnO₂), non-rechargeable |
| Dimensions (standard CR2032) | 20 mm diameter × 3.2 mm thick |
| Use | Single use |
| Key fob included | No |
| Cells per Mazda key | 1 |
| Mazda key battery life guide | About 1 year (2021 Mazda6 manual) |
| Reference capacity (Panasonic CR2032) | 225 mAh |
| Deluxe capacity, weight, temperature range, shelf life | Not published for this pack |
Deluxe does not publish a technical datasheet for this pack. Chemistry and size describe the standard CR2032 format, and the capacity row is a Panasonic reference value, not a Deluxe rating. Real-world capacity depends on load, temperature and the device cutoff voltage.
Mazda6 Key Battery Replacement Difficulty
This is a fairly easy job that needs care, not skill. You only need a flathead screwdriver wrapped in tape and a steady hand. The main risks are buying the wrong battery type and damaging the key’s terminals or circuitry. Mazda gives owner instructions but also recommends a dealer to help prevent damage to the key. Tap a slice to highlight it.
- 30% Opening the covers
- 20% Cap & contacts
- 35% Choosing the right battery
- 15% Reassembly & testing
Difficulty score and effort split are an editorial estimate based on Mazda’s owner’s manual procedure, not an official rating. Mazda gives no fixed time for the job. No programming step appears in Mazda’s battery replacement instructions.
How to Replace Your Mazda6 Key Fob Battery
These steps cover the CR2032 keys (2021 Mazda6 and 2020 Type B). Mazda calls for a flathead screwdriver wrapped in tape. Follow the pictures in your owner’s manual for the exact pry points. Tap each step to tick it off as you go.
- 1Remove the lower coverPress the release knob and take off the lower cover of the key.
- 2Unlock the upper coverPress the tab to unlock the upper cover.
- 3Lift off the upper coverPut the tape-wrapped screwdriver into the gap shown in the manual, slide it and twist to remove the cover. Do not touch the internal circuitry or bend the terminals.
- 4Take out the old batteryRemove the battery cap with the screwdriver, then take out the old CR2032. Keep it away from children and pets.
- 5Insert the new CR2032Place the new battery with the positive (+) side up, then refit the battery cap.
- 6Close the keyRefit the upper cover. Insert the lower cover tabs into the slots and install the lower cover. Then test the lock and unlock buttons.
Check that the battery type is correct, the positive side faces up, the cap is seated and the terminals are not bent. If the key still fails, have the key or car checked at an Authorized Mazda Dealer.
The 2019 Mazda6 and the 2020 Type A key use a CR2025 and have a different opening process, including a rubber ring that must stay in place. This CR2032 pack is not the right battery for them.
Other Devices That Use a CR2032
The CR2032 is a common coin cell. Use this pack only in a device whose manual calls for a CR2032.
- Car key fobsOnly if the key lists CR2032
- Keyless entry remotesCheck your manual
- Apple AirTagCheck the coating note below
- Heart-rate monitorsCheck your manual
- Glucose monitorsCheck your manual
- Toys & gamesSmall battery-powered items
- Memory backupSmall electronics
Apple warns that some CR2032 batteries with bitterant coatings might not work with AirTag, depending on how the coating lines up with the battery contacts. Look for packaging that states AirTag compatibility.
Safety, Storage & Disposal
A swallowed lithium coin battery can cause serious injury in as little as two hours. Keep new and used cells away from children. Get emergency medical help immediately if you suspect ingestion.
- Never recharge, crush, open, short-circuit or burn it.
- Keep spare cells in the original pack until you need them.
- Keep used cells out of household trash and recycling bins.
- Tape the terminals or bag each cell, then use a battery collection point.
Mazda6 Key Battery: FAQ
What battery does a Mazda6 key fob use?
It depends on the key. Mazda’s U.S. owner’s manuals list CR2025 for the 2019 Mazda6 and the 2020 Type A key, and CR2032 for the 2020 Type B key and the 2021 Mazda6.
Can I use a CR2032 in a key that needs a CR2025?
No. Both are 3V and 20mm wide, but a CR2032 is 3.2mm thick and a CR2025 is 2.5mm thick. Mazda says to replace the battery with the same type.
How many batteries does one Mazda6 key need?
One. The Deluxe pack contains two cells, which gives you one replacement and one spare.
Is the Deluxe CR2032 an official Mazda battery?
Deluxe’s listing says its cells come from the same manufacturer Mazda uses. The listing does not name that manufacturer or show Mazda approval, so treat it as a brand claim.
How long does a Mazda6 key battery last?
Mazda’s 2021 Mazda6 manual says key battery life is about one year and suggests replacing it about once a year. This is Mazda’s guidance, not a Deluxe-specific runtime figure.
Do I need to reprogram the key after a battery change?
Mazda’s battery replacement instructions do not include a programming step.
Can I start the Mazda6 if the key battery is dead?
On the 2021 Mazda6, hold the brake pedal firmly and wait for the start button indicator to flash green. Align the center of the Mazda emblem on the key with the center of the start button until the indicator turns green, then press the start button. Other model years can differ.
Is the CR2032 rechargeable?
No. A standard CR2032 is a single-use lithium/manganese dioxide cell and must never be recharged.
How should I dispose of a used CR2032?
Do not put it in household trash or recycling bins. Tape the terminals or bag each cell individually and take it to a battery collection or hazardous-waste service. Keep used cells away from children.
