What is a battery code?

A battery code is an alphanumeric identifier printed on battery cells by manufacturers like CATL, REPT, and EVE. It encodes information about the manufacturer, battery chemistry (LFP, NMC), capacity, voltage, and production date.

How do I read a battery production date code?

A battery production date code records the year and month a cell was manufactured, embedded within the full battery code. Paste the complete code into the Battery Days decoder and it extracts the production date automatically, along with the manufacturer, chemistry, capacity and voltage. For Chinese GB/T-standard cells the date is encoded positionally within the 24-character code, and the decoder handles that parsing for you.

How do I decode a CATL battery code?

Enter your CATL battery code into the Battery Days decoder. The tool automatically identifies the manufacturer, extracts the product type, battery chemistry, capacity (Ah), voltage, and production date from the code structure. It also corrects common OCR scanning errors.

Which battery manufacturers are supported?

Battery Days supports codes from major manufacturers including CATL, REPT, EVE Energy, Gotion, BYD, and others. The database is regularly updated as new manufacturers and code formats are added.

Is the Battery Days API free to use?

Yes, the Battery Days REST API is free to use. You can decode battery codes programmatically via GET or POST requests. An embeddable widget is also available for integrating the decoder directly into your own website.

What information can I get from a battery code?

A decoded battery code reveals the manufacturer name, battery chemistry (e.g., LFP, NMC), rated capacity in Ah, nominal voltage, product type or series, and the production date including year, month, and sometimes the specific production line.

Battery factory map

Every major manufacturing site of the world's leading lithium-ion cell makers — the Chinese brands BatteryDays decodes, plus the major Japanese, Korean and Western makers (Panasonic, LG, Samsung SDI, SK On, Tesla and more). Filter by cell chemistry, or by the automotive and energy-storage brands each maker supplies.

What is a battery factory?

A battery factory — a large one is often called a gigafactory — is an industrial plant where a battery cell manufacturer mass-produces lithium-ion cells: prismatic LFP cells (like the 280Ah and 314Ah ESS cells), pouch NMC cells, and cylindrical cells (18650, 21700, 4680, 32700, 22650 and 14430 formats). This map shows where lithium batteries are manufactured — plotting the gigafactories behind the cells found in EVs, home energy storage and start-stop batteries, so you can see which maker builds where and which car and energy-storage brands each plant supplies.

Chemistry

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Used by energy-storage brand

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