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

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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.

AG13 battery

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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VORHERIG：

: SEMITEC Konstantstromdiode (CRD) Anwendungsreferenzhandbuch

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