Coin cell battery numbers indicate the dimensions. e.g. a 2477 is 24mm x 7.7 mm

Coin cell discharge data

• https://web.archive.org/web/20210903034739/https://hackaday.io/project/28432-coin-cell-jump-starter/log/71554-coin-cell-discharge-tests
• https://web.archive.org/web/20210125150138/https://hackaday.io/project/28432-coin-cell-jump-starter/log/71669-more-coin-cell-discharge-data