Every key fob in these makers’ manuals takes a coin battery: a CR2032 in many cars, and a CR1620, CR2016, CR2025 or CR2450 in some keys.
The battery it takes
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Check the code on the old battery
The code printed on the old battery is the surest answer, such as CR2032 or CR2450. Open the key, read the code, and fit a new battery with the same code. Your owner’s manual names it too, under replacing the key battery.
One brand can use several sizes, by model, year and whether the car has a smart key, so the brand alone isn’t always enough.
Model 3 (2024+) and Model Y (2025+), North America
Each brand’s page has more models and the maker’s own steps. Other models may differ, so check your own owner’s manual.
Which way up it goes
The side that faces up isn’t the same in every key. GM’s manuals put the positive side toward the back cover in the 2022 GMC Acadia, facing up in one 2021 Sierra 1500 key and facing down in the 2022 Cadillac XT5. Note which way the old battery sits before you take it out.
Other car brands
For BMW, Volkswagen, Lexus and Acura, read the code on the old battery or look in the owner’s manual.
Keep coin batteries away from children
The National Capital Poison Center says that if anyone swallows a battery, immediately call the 24-hour National Battery Ingestion Hotline at 1-800-498-8666 or your poison center at 1-800-222-1222. Don’t delay. Immediate treatment decreases severity.
Common questions
Do GM key fobs all take a CR2032?
Not all: in the GM manuals read, the Chevrolet Malibu and Trax, GMC Acadia, Terrain and Sierra 1500, Buick Enclave and Cadillac XT5 and Escalade keys each take a CR2032 or equivalent, but the 2022 Cadillac CT5's takes a CR2450.
Do Jeep, Ram, Dodge and Chrysler key fobs take the same battery?
Mostly: the Jeep Cherokee and Compass, Ram 2500 and 3500, Dodge Durango and Chrysler Pacifica manuals each name one CR2032, but Jeep's 2021 Wrangler manual recommends a CR2450.
Each brand’s answer comes from that car maker’s own owner’s manuals (Honda’s from Honda Canada, Ford’s Escape and electric Explorer from its New Zealand and UK editions, Mercedes-Benz’s from the C-Class Saloon’s UK edition), Nissan’s also from its parts site, and the safety line from the National Capital Poison Center, all read on October 25, 2026. Checked against published data from Ford, Nissan, Kia, Subaru and Jeep (plus 12 more).
See all 25 sources
National Capital Poison Center, Button battery ingestion (poison.org/battery)
Ford, F-150 owner's manual, Canada, Mexico and United States edition (edition date 202407), PDF
Ford, Escape owner's manual, New Zealand edition (CG3994en, vehicles built from 02-09-2025), PDF
Ford, electric Explorer owner's manual, UK edition (CG3968en, edition date 202408), PDF
Mercedes-Benz, C-Class Saloon Owner's Manual, UK edition (F206 0170 02), PDF
Tesla, Model 3 (2024+) Owner's Manual, North America, software version 2026.32
Tesla, Model Y (2025+) Owner's Manual, North America, software version 2026.32
Battery sizes come from battery makers' datasheets and device makers' own manuals and help pages. Check your device's manual or the old battery before you buy. If anyone may have swallowed a battery, call the National Battery Ingestion Hotline at 1-800-498-8666 or your poison center at 1-800-222-1222 straight away.