Maxell LR43 Alkaline Battery

Maxell LR43 Alkaline Button Cell (1.5V)

The Maxell LR43 is a compact, 1.5V alkaline button cell designed for small electronics that need reliable, everyday power. Its mid-size profile (11.6 mm diameter × 4.2 mm height) and roughly 115 mAh capacity make it a practical fit for thermometers, watches, laser pointers, calculators, and small meters.

Key Specifications

• Model: Maxell LR43 (IEC: LR43)
• Chemistry: Alkaline (1.5V nominal)
• Capacity: ~115 mAh (typical, at low-drain)
• Dimensions: 11.6 mm (dia) × 4.2 mm (height)
• Weight: ~1.6 g
• Operating temperature: -10°C to +60°C
• Common cross-references: AG12, L1142, 186 (verify device markings)

When to Choose the LR43

• Use if your device specifies LR43/AG12/186/L1142 and has low-to-moderate current draw (e.g., calculators, small meters, laser pointers).
• Choose for cost-effective power where absolute voltage flatness is not critical.
• Avoid if your device explicitly calls for silver-oxide (SR) cells or requires very flat voltage over the entire discharge (e.g., certain precision instruments). In those cases, consider SR43 equivalents.
• Do not substitute with LR44: same diameter but thicker (5.4 mm) and likely won’t fit.

Typical Applications

• Digital thermometers and small medical instruments (check manufacturer guidance)
• Watches and compact timers
• Calculators and mini remote controls
• Laser pointers, small LED lights, and novelty electronics
• Handheld meters and testers with intermittent use

Performance Notes and Runtime Examples

Alkaline LR43 cells provide steady 1.5V for most of their service life, with some voltage drop as they near depletion. Actual runtime depends on load, duty cycle, and temperature.

• Laser pointer (~20 mA): about 3–5 hours of continuous use; longer with intermittent use.
• Digital thermometer (~5 mA intermittent): roughly 15–20 hours of active use spread over weeks of typical household use.
• Cold environments reduce capacity; keep spares at room temperature.

Compatibility and Cross-Reference

• Markings you may see: LR43, AG12, L1142, 186.
• Silver-oxide alternatives (SR43-series) share physical size and can offer flatter voltage and longer life but at higher cost; use only if the device permits.
• Not rechargeable. Do not mix with rechargeable or different chemistries in the same device.

Storage, Handling, and Safety

• Store in a cool, dry place in original packaging. Typical shelf life up to ~3 years when stored properly.
• Keep away from children—button batteries pose ingestion hazards. If swallowed, seek immediate medical attention.
• Avoid short-circuiting: do not carry loose cells with metal objects. Tape terminals of used cells before recycling.
• Replace all cells in a device at the same time; do not mix old and new batteries.

Replacement Steps

1. Open the battery compartment using the correct tool.
2. Note polarity (+ side is typically the flat top) and remove the old cell.
3. Insert the new Maxell LR43 with the same orientation.
4. Close the compartment securely and test the device.

Size Comparison

Type	Diameter	Height	Voltage	Typical Capacity	Common Uses
LR41	7.9 mm	3.6 mm	1.5V	~25 mAh	Thermometers, small watches
LR43	11.6 mm	4.2 mm	1.5V	~115 mAh	Watches, medical devices, calculators
LR44	11.6 mm	5.4 mm	1.5V	~110 mAh	Watches, calculators, toys

FAQ

Is LR43 the same as AG12 or 186?

Yes. AG12 and 186 are common retail codes for the LR43 size. Always confirm the size and chemistry your device specifies.

Can I use a silver-oxide SR43 instead of LR43?

Often yes, if the device accepts it. SR43 cells have the same size with flatter voltage and potentially longer life, but they usually cost more. Follow the device manufacturer’s guidance.

Is the LR43 rechargeable?

No. LR43 is a primary (single-use) alkaline cell. Do not attempt to recharge.

How should I dispose of used LR43 batteries?

Recycle at an authorized battery collection point. Do not dispose of in household trash. Tape the terminals to prevent short circuits during transport.

Will an LR44 fit if I can’t find LR43?

No. LR44 is thicker (5.4 mm vs 4.2 mm) and generally will not fit compartments designed for LR43.