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Based on the manufacturer's specs, the 2012 Mazda3 key fob requires a CR1620 3-volt coin cell battery, typically used for watches and other electronics. Prices for these batteries are quite affordable, ranging from $5 to $10 per pack depending on the brand and quantity. If your key fob stops working, the battery is the first thing to check, as the car will notify you if it needs to be replaced. If a new battery doesn't solve the issue, it may be a faulty key transponder that you should have replaced by the supplier.
The type of battery for the key fob on a 2012 Mazda 3 is CR1620.