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About WhichBatteryDoesItUse

Battery packets use a confusing mix of codes: the same watch cell is sold as 377, SR626SW, AG4 and SR66. This site puts every code for a battery on one page, with its exact size, and says plainly which other batteries can replace it and which cannot.

It covers 78 battery sizes, 18 common devices and key fobs for 23 car makes. Sizes follow the IEC 60086 standard; capacities are typical figures from manufacturer datasheets. Device and key fob entries give the size most models use, so always check the code on your old battery.

We are independent and not affiliated with any battery maker or retailer. Found an error or a device we should add? Tell us.