What Is an AG13 Battery? Size, Equivalents, and Applications Explained | BomKey Electronics

AG13 Battery Specifications

Size & Chemistry

AG13 is a medium-size coin cell at roughly 11.6 × 5.4 mm. It uses alkaline chemistry (zinc anode, manganese dioxide cathode), providing a stable 1.5 V profile for everyday electronics. For precision devices that benefit from a flatter discharge curve, consider the silver-oxide equivalents (SR44/357) with 1.55 V.

Equivalents & Alternatives

Direct Equivalents (same size, alkaline)

• LR44, A76, L1154, 157, G13/G13A, LR1154

Silver-Oxide Alternatives (premium performance)

• SR44, 357, SR44W (high-drain), SR44SW (low-drain)

Tip: Silver-oxide versions typically offer longer runtime and better voltage stability than alkaline, useful for watches, meters, and cameras.

AG13 vs LR44 vs SR44

Typical Applications

• Watches & small clocks
• Calculators & digital calipers
• Laser pointers & LED key lights
• Thermometers & basic medical devices
• Toys, novelty gadgets, small remotes

How Long Does AG13 Last?

Runtime depends on load and temperature. In low-drain devices (watches, calculators), an AG13 can last up to 1–2 years. In higher-drain devices (pointers, toys), expect months of use. Silver-oxide SR44/357 usually lasts 30–50% longer under comparable conditions.

How to Replace an AG13 Battery

1. Open the compartment with a small screwdriver or case knife (if it's a watch, follow the case-back style).
2. Note polarity before removal (flat = −, raised = +).
3. Remove the old cell using plastic/ESD-safe tweezers; avoid touching contacts.
4. Clean contacts with a dry, lint-free swab.
5. Insert the new AG13/LR44 (or SR44/357 upgrade) with correct polarity.
6. Close and test; confirm the device powers on correctly.

Safety & Disposal

• Do not recharge alkaline button cells.
• Keep away from children; ingestion can be dangerous.
• Avoid mixing new and used cells in one device.
• Store cool and dry; remove from idle devices to prevent leaks.
• Recycle through authorized battery collection points.

Frequently Asked Questions

Where to Buy AG13 Batteries

Choose reputable sellers and check freshness (date codes). Consider silver-oxide SR44/357 if you need longer life for precision devices.

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