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How to Replace the Key Battery in a Mazda 3

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

If the battery in your Mazda 3 key is completely flat and you don't know how to replace it, this guide is all you need. Simply follow the steps outlined to carry out the entire operation without any difficulty. Get a flat screwdriver and insert it into the side slot of the cover. Apply slight pressure and separate the top part of the cover from the bottom part. Take the bottom part and open it. Locate the battery and proceed with its replacement. Refit the cover correctly, and you're done.

Updated on 24 May 2026 by ScegliAuto

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