Maxell LR41 Alkaline Battery (LR736, AG3)

The Maxell LR41 is a compact 1.5V alkaline button cell designed for low- to moderate-drain devices such as digital thermometers, watches, calculators, laser pointers, and small toys. It offers stable voltage in a tiny form factor and dependable leak resistance for everyday use.

When to Choose This Battery

• Use if your device specifies LR41, LR736, AG3, or 192 (alkaline).
• Acceptable in low-drain or intermittent-use devices where compact size is critical.
• Avoid if your device specifies SR41/392/384 (silver oxide) or requires long, stable runtime; choose silver oxide instead.
• Do not substitute with LR44 or other larger cells—dimensions differ and may damage the device.

Key Specifications

• Model: Maxell LR41 (IEC: LR736)
• Chemistry: Alkaline
• Voltage: 1.5 V nominal
• Capacity: ~25 mAh (typical)
• Size: 7.9 mm diameter × 3.6 mm height
• Weight: ~0.6 g
• Operating temperature: −10°C to +60°C (14°F to 140°F)
• Typical shelf life: 2–3 years at room temperature

Common Size Codes and Cross-References

• Alkaline (same size): LR41, LR736, AG3, 192
• Silver oxide (same size, longer life): SR41, SR736, 392, 384

Note: Silver oxide cells (SR41/392/384) provide a flatter 1.55 V discharge and higher capacity; use them when specified or when longer runtime and stable voltage are important.

Use Cases

• Digital thermometers and medical probes (check your manual; many specify SR41/392)
• Analog and digital watches (basic models)
• Calculators and key fobs
• Miniature toys, laser pointers, LED gadgets

Runtime Expectations (Simple Estimates)

With ~25 mAh capacity, approximate continuous runtimes are:

• Very low drain (0.1–0.3 mA, e.g., simple watch): months to over a year
• Moderate drain (1–5 mA, e.g., small gadgets): several hours to a few days of active use
• Higher burst drain (5–20 mA, e.g., small laser/LED): tens of minutes to a few hours of active use

Intermittent use extends real-world life. For longer, steadier performance at the same size, choose SR41/392 silver oxide.

LR41 vs Alternatives

Cell	Chemistry	Voltage	Capacity (typ.)	Notes
LR41 (this item)	Alkaline	1.5 V	~25 mAh	Cost-effective for low-drain devices
SR41 / 392 / 384	Silver oxide	1.55 V	~35–45 mAh	Flatter discharge, longer runtime; preferred for precision
LR44	Alkaline	1.5 V	~110–150 mAh	Larger (11.6 × 5.4 mm); not size-compatible with LR41

Installation

1. Power off the device if possible.
2. Open the battery compartment using the correct tool.
3. Note polarity (+ on the flat side). Match the orientation in the device.
4. Insert the new LR41; avoid touching both terminals simultaneously.
5. Close the compartment and test the device.

Tip: Replace all cells in multi-battery devices at the same time. Do not mix alkaline and silver oxide cells together.

Storage and Handling

• Store in original packaging in a cool, dry place away from metal objects.
• Avoid temperatures above 60°C (140°F) and high humidity.
• Do not carry loose button cells; they can short-circuit.

Safety and Disposal

• Keep out of reach of children. Button batteries can cause severe internal burns if swallowed—seek immediate medical attention if ingestion is suspected.
• Do not recharge, crush, or incinerate.
• Recycle through approved battery collection points. Before disposal, tape over the battery faces to prevent shorting.

FAQ

Is LR41 the same as 392 or SR41?

They are the same size but different chemistries. LR41 is alkaline (1.5 V), while 392/SR41 is silver oxide (1.55 V) with a flatter discharge and longer runtime. Use what your device specifies; silver oxide is often preferred for precision and longevity.

Can I replace SR41/392 with LR41?

Only if the device manual allows it. LR41 will fit but may deliver shorter life and slightly less stable voltage in sensitive devices.

How long does an LR41 last in a thermometer?

It varies by model and usage. For intermittent-use thermometers, expect many measurement cycles; frequent use or backlit displays shorten life. Silver oxide (SR41/392) typically lasts longer at the same size.

Why did my new battery drain quickly?

Possible causes include mixed old/new cells, unsuitable chemistry (alkaline vs silver oxide), high standby drain in the device, poor contacts, or storage at high temperatures. Verify the specified chemistry and clean contacts before replacement.

Are LR41 batteries rechargeable?

No. LR41 alkaline cells are single-use. Do not attempt to recharge.