Button cell vs coin cell
Informally interchangeable terms. Where distinguished, coin cells are wide, thin 3 V lithium types and button cells are taller 1.5 V alkaline or silver oxide types.
Most people, and most shops, use these two terms to mean the same thing. Where a distinction is drawn, a coin cell is the wide, thin 3 volt lithium type like a CR2032, and a button cell is the smaller, chunkier 1.5 volt type like an LR44 used in watches and calculators. No standard enforces the split, so do not rely on the word — always buy by the code printed on the cell.
- Verdict:
- Mostly the same words — where it matters, coin means the thin 3 V ones
Side by side
| Specification | Button cell | Coin cell |
|---|---|---|
| Typical voltage | 1.5–1.55 V | 3 V |
| Typical chemistry | Alkaline or silver oxide | Lithium |
| Shape | Taller for its width | Wide and thin |
| Example | LR44, SR44 | CR2032, CR2025 |
| Codes start with | LR, SR | CR, BR |
| Defined by a standard? | No | No |
Why there is no firm answer
IEC 60086 names cells by chemistry and dimensions and never uses either word. “Button” and “coin” are trade language that grew up alongside it, so different manufacturers draw the line in different places.
The useful distinction
If someone says coin cell they almost always mean a 3 V lithium cell with a four-digit code where the digits are the size — CR2032 is 20 mm across and 3.2 mm thick. That is a genuinely different animal from a 1.5 V LR44.
Buy by the code
Because neither term is defined, neither is safe to order by. The code on the cell carries the chemistry, the diameter and the thickness, which is everything you need.
Check before you swap. Batteries with similar dimensions are not always interchangeable. Always verify voltage, chemistry and the requirements printed in your device manual before fitting a replacement.