It takes one CR2450: a coin battery, about the size of a quarter.
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You’ll need: Mechanical key blade
Take out the metal key and use its tip in the little slot to separate the two halves.
Look at which way up the old one sits, then put the new one in the same way.
Press the halves together until they click, then try lock and unlock.
Older BMW keys use a different, thinner cell. Check the code on yours before you buy.
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A new battery usually lasts about 2 years in this device.
That’s around November 2028.
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It takes CR2450, a coin battery.
Yes. DL2450, ECR2450, 5029LC are the same battery with other names.
Usually about 2 years, depending on how much you use it. Most devices warn you when it gets low.