Question 1

What is a battery code?

Accepted Answer

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.

Question 2

How do I decode a CATL battery code?

Accepted Answer

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.

Question 3

Which battery manufacturers are supported?

Accepted Answer

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.

Question 4

Is the Battery Days API free to use?

Accepted Answer

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.

Question 5

What information can I get from a battery code?

Accepted Answer

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.

Cell	Capacity	Dimensions
314Ah314 Ah—
230Ah230 Ah—

CALB

CALB cells (2)