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if you have your hand book i would read throught to see section on changing batteries , sometimes you only have a limited time to swap your batties or you will lose the programming to operate your lock/unlock button
It is a round flat one. With all these 4 number batteries the number dscribes the size. A 1620 is 16mm diameter and 2.0mm thick. a 2025 would be 20mm dia and 2.5mm thick etc. Watch out as there is a 2016 which won't fit your fob.