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BMW key fob battery

Most current BMW keys use a CR2032; some older keys use a CR2450, and some keys (such as the Display Key) are rechargeable.

BatteryUsed inSizeCapacity
CR2032BMW (most common)20 mm × 3.2 mm≈ 225 mAh
CR2450BMW (older models)24.5 mm × 5 mm≈ 620 mAh
CR2032⌀20 × 3.2 mmCR2450⌀24.5 × 5 mm
CR2032, CR2450 at the same scale.

BMW: starting with a dead fob

Hold the key against the marked spot on the steering column or in the console tray, then press start.

Not sure which you have? See CR2032 vs CR2450: same look, different size.

To change it: release and pull out the metal key, twist its tip in the seam to split the case, and fit the new cell the same way up. Step-by-step guide.

Also mainly CR2032: Volkswagen, Audi, Jeep, Ram.

Key types change between model years; the code on your old battery is final.