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Replacing the Key Battery for the Mazda 3

Model: Mazda 3 MK 3, BN, BM - Years 2013-2019
Part: Key

Here are the step-by-step instructions to disassemble and replace the battery of the remote key for the Mazda 3. First, take your remote and remove the physical key from inside it; then, use the gap created to pry off the plastic rear cover, removing the battery found inside, as shown in the video. At this point, install the suitable battery (in this case, a CR 2025 3V), inserting it in the correct orientation in the remote; finally, reattach the plastic cover and the physical key.

Updated on 30 July 2026 by ScegliAuto

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