What battery is that?
Type any code on a button or coin battery, LR44, CR2032, 377, AG13, and get its exact equivalents, size, voltage and what replaces it.
Coin lithium (CR)
3 V lithium coins for key fobs, motherboards, scales and remotes.
Button alkaline (LR / AG)
1.5 V alkaline buttons for toys, calipers and small gadgets.
Silver-oxide watch (SR)
1.55 V silver-oxide cells, the standard for watches.
Hearing aid (zinc-air)
1.45 V zinc-air cells sold by color-coded size tabs.
Specialty cylindrical
12 V and 1.5 V specialty stacks for remotes and doorbells.
Rechargeable coin
LIR/ML rechargeable coins. Not always a safe CR swap.
Photo lithium
3 V high-drain lithium cylinders for cameras and flashlights.
Cylindrical lithium (AA/AAA)
1.5 V lithium AA and AAA cells: lighter, cold-tolerant, long shelf life.
Specialty silver-oxide
6 V silver-oxide stacks for older cameras and test meters.
Popular comparisons
One battery, many names
Button batteries carry up to five names from three naming systems, which is why buying a watch battery feels like a puzzle. The IEC code describes chemistry and size (SR626SW), the ANSI number is a catalogue index (377), and brands add their own aliases (AG4). CellChart maps them all to one page per physical cell, so whatever code you have, you land on the right battery and its safe substitutes.
Start with the full size chart, or read how battery naming works.
⚠️ Keep away from children. Swallowed button batteries, especially 20 mm lithium coins, cause severe injury within hours. If a child swallows one, call the 24/7 National Battery Ingestion Hotline (US) at 800-498-8666 or poison control at 800-222-1222 immediately. What every parent should know.
Frequently asked questions
How do I find what battery I need?
Why does one battery have five different names?
Can I swap alkaline and silver-oxide watch batteries?
Are lithium coin batteries dangerous for kids?
From the blog
How to dispose of and recycle coin cell batteries
A dead coin cell is not a harmless one. Tape it, keep it out of reach and take it to a battery drop-off, not the kitchen bin.
storageStoring spare coin cells: shelf life, heat and loose cells
A sealed coin cell can sit for years and still work. A loose one in the junk drawer is a short circuit, and a child safety problem, waiting to happen.
markingsHow to read the code stamped on a coin cell battery
Turn the cell over before you buy a replacement. The engraving is a size, a chemistry and a polarity, and it is the only reference that never goes out of date.