About this site
Battery Equivalent Chart answers one question as directly as it can: which battery replaces the one in your hand. 84 button and coin cells, 284 codes between them, and the swaps that are safe to make.
Who writes it
I'm Aditya Arora, and I build small, free reference tools that each answer one question properly. This one exists because a button cell is rarely sold under the code printed on the old one. The same cell goes by half a dozen names, and some swaps that fit physically will run a device flat, damage it or put a child at risk. Every size, voltage and swap on this site comes from published IEC naming and manufacturer datasheets, and every swap rule is covered by automated tests before a page goes live. If you spot an error, email [email protected] and I'll fix it.
Where the data comes from
Every size, voltage, typical capacity, alias and drain number on this site comes from one dataset, and nothing on a page is written from memory. The sources behind it are:
- IEC 60086 naming. The chemistry letters, the round-cell R, and the digits that give the case size are the international standard's, which is why a code can be read at all.
- Manufacturer cross-reference charts and datasheets. The alias codes are taken from the published cross-references the manufacturers themselves put out, which is how one cell ends up with a dozen numbers against it.
- Renata, for the drain pairs. The low-drain and high-drain numbering on silver-oxide watch cells is a manufacturer convention rather than part of the standard, and the 14 cells here that carry both numbers follow Renata's numbering, cross-checked against Maxell and Energizer.
The source line recorded in the data reads: Wikipedia List of battery sizes (button cell tables, retrieved 2026-10-31) + Renata/Energizer SW/W numbering; spot-check before launch. Later additions: LR44 alias L1154F from the Rayovac cross-reference guide (rayovac.com/cross-reference-guide) and Wikipedia's LR44 alternative designations; SR920SW drain numbers V371 (Varta, low drain) and V370 (Varta, high drain), the latter from Maxell's cross-reference chart (maxell-usa.com, Watch High Drain) and Varta's V370 datasheet. Silver-oxide capacities, the SR920, SR927 and SR512 heights, the SR927 IEC designation and the SR42 drain pair are from the Renata Scope of Supply + Cross Reference Guide, version 02.2023.
How the swap rules work
No verdict on this site is typed out by hand. Each one is computed from the two cells' recorded diameter, height, chemistry and voltage, by the same five rules everywhere: same size and chemistry is a direct replacement, alkaline to silver oxide is an upgrade, silver oxide to alkaline runs out sooner, a different height is a question about the holder, and a different voltage is not a replacement at all. A zinc-air hearing-aid cell and a rechargeable LIR are never equivalents, whatever their dimensions say.
That is deliberate. It means the 14 comparison pages and 16 code pages cannot disagree with each other or with the chart, and that a correction to the data corrects every page at once.
Corrections
If a size, a voltage or an equivalent here does not match the cell in front of you, that is worth knowing about. Email [email protected] with the code, what the page says and what you measured or read on the pack. Corrections with a source attached get made quickly.
Nothing here is a substitute for the device's own manual. Where the manual and this site disagree, the manual wins.