Format: Letter (month) + Number (year). Example: M2 = December 2022
How to Read Battery Date Codes
Most batteries use a simple letter-number format for their date codes:
- Letter: Represents the month (A = January, B = February, etc.)
- Number: Represents the year (2 = 2022, 3 = 2023, etc.)
For example, C3 would mean March 2023.
Month Codes
- A = January
- B = February
- C = March
- D = April
- E = May
- F = June
- G = July
- H = August
- J = September
- K = October
- L = November
- M = December
Typical Battery Shelf Life
- Alkaline: 5-10 years
- Lithium: 10-15 years
- Rechargeable NiMH: 2-5 years
- Button Cell: 5-10 years
- 9V Alkaline: 5-7 years
About Battery Date Codes
Battery manufacturers use date codes to indicate when a battery was produced and to help determine its expiration date. Understanding these codes can help you manage your battery inventory and ensure you're using batteries before they expire.
While most manufacturers use the letter-number format described above, some may use different systems. If you're unsure about a specific battery's date code, it's best to check the manufacturer's website or contact their customer service.
Tips for Battery Storage
- Store batteries in a cool, dry place at room temperature (around 68-77°F or 20-25°C).
- Avoid storing batteries in extreme temperatures, which can reduce their lifespan.
- Keep batteries in their original packaging until ready to use.
- Don't mix old and new batteries or different types of batteries.
- Remove batteries from devices that won't be used for extended periods.