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What Is an AG13 Battery? Size, Equivalents, and Applications Explained | BomKey Electronics
Article Details
AG13 Battery Specifications
| Parameter | Value |
|---|---|
| Chemistry | Alkaline Manganese Dioxide (Zn/MnO2) |
| Nominal Voltage | 1.5 V |
| Typical Capacity | ~110–130 mAh (light load) |
| Diameter | ≈ 11.6 mm |
| Height | ≈ 5.4 mm |
| Operating Temperature | −10 °C ~ +60 °C |
| Shelf Life | ~3–5 years (cool, dry storage) |
| Common Designations | AG13, LR44, A76, L1154, 157, G13A |
| Polarity | Flat side = negative (−); raised button = positive (+) |
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
| Feature | AG13 (Alkaline) | LR44 (Alkaline) | SR44 / 357 (Silver Oxide) |
|---|---|---|---|
| Nominal Voltage | 1.5 V | 1.5 V | 1.55 V |
| Chemistry | Alkaline | Alkaline | Silver oxide |
| Capacity | ~110–130 mAh | ~110–130 mAh | Higher & more stable |
| Discharge Curve | Declining | Declining | Flat (stable) |
| Best For | Toys, remotes, calculators | Same as AG13 | Watches, meters, cameras |
| Price | Very low | Low | Higher |
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
- Open the compartment with a small screwdriver or case knife (if it's a watch, follow the case-back style).
- Note polarity before removal (flat = −, raised = +).
- Remove the old cell using plastic/ESD-safe tweezers; avoid touching contacts.
- Clean contacts with a dry, lint-free swab.
- Insert the new AG13/LR44 (or SR44/357 upgrade) with correct polarity.
- 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
Is AG13 the same as LR44?
Yes. AG13, LR44, A76, and L1154 are equivalent alkaline button cells with the same size and nominal voltage.
Can I use SR44 instead of AG13?
Yes. SR44/357 is a silver-oxide alternative with 1.55 V and a flatter discharge curve, generally providing longer life.
What size is an AG13?
Approximately 11.6 mm diameter by 5.4 mm height.
How long does an AG13 last?
Up to 1–2 years in low-drain devices; months in higher-drain uses. Silver-oxide versions last longer.
Are AG13 batteries rechargeable?
No. They are primary alkaline cells and should never be recharged.
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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What Is an AG13 Battery? Size, Equivalents, and Applications Explained | BomKey Electronics
Looking for an AG13 battery? Learn its specs, common equivalents (like LR44, A76), typical applications, and how to choose the right replacement in this complete guide.
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