Sometimes the number on a watch (button) or coin type battery is not very well stamped and impossible to read.
This page is a chart of the sizes to assist you to find the correct battery from just the measurements.
The table is laid out in ascending diameter × thickness.
All measurements are in mm and specifications generally allow up to ±0.5 mm tolerance, although some manufacturers can't seem to keep within ±1 mm!
How to use: