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Here is a quick little video of me showing you how to replace the battery on a Mazda 3 and Mazda 6 Key fob. This fob covers the years 2004-20068 Hope it was helpful!
Part number P/N : KPU41794
This remote also fits:
07 08 Mazda 3
03 04 05 Mazda 6 hatchback
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Battery you need – https://amzn.to/2YuDne3