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1. Find the code
Look on the flat side of a coin or button battery, or along the side of a stick battery. You may need a torch and a magnifying glass for small ones.
2. The first letters tell you the type
CR means a 3-volt lithium coin. LR means a 1.5-volt alkaline button. SR means a silver watch battery. PR is a hearing aid battery.
3. The numbers tell you the size
In CR2032, “20” means 20 mm wide and “32” means 3.2 mm thick. So a CR2025 is just as wide but thinner.
4. Brands add their own names
DL2032 (Duracell) and ECR2032 (Energizer) are both just CR2032. AG13, A76 and 357 are other names for the LR44 size.