What the letters mean
LR / AG — alkaline (usually 1.5V).
SR / SG — silver oxide (usually 1.55V).
CR / BR — lithium coin (usually 3V).
DL / ECR — brand names for CR lithium batteries.
What the numbers mean on lithium cells
On many CR batteries the number is the size: CR2032 is about 20.0 mm across and 3.2 mm thick.
CR2025 and CR2016 are the same width but thinner — they are not drop-in swaps.
Button and watch codes
Codes like SR626SW encode size in millimetres.
Shop shorthand like L1154 is often the same alkaline battery as LR44 / AG13 / A76.
Use our tools
Code lookup turns other names into the standard code. The code checker shows when names match — and when the same size is still a different battery.