LR41 Battery Equivalent Chart and Low-Power Device Applications

Published: June 16, 2026

LR41 is a small 1.5 V alkaline button-cell size used in compact electronic devices. It is often cross-referenced with AG3 and L736-style names. Silver-oxide versions such as SR41, 384, and 392 may share a similar size family but use different chemistry and voltage behavior. For device repair or PCB design, the safest replacement process is to check the original cell code, holder dimensions, nominal voltage, chemistry, and device current requirement. Equivalent names are useful, but they are not a substitute for checking the circuit, especially when the board also contains sensors, switches, or low-power control ICs.

LR41 Equivalent Overview

Code	Typical Chemistry	Nominal Voltage	Typical Size	Compatibility Note
LR41	Alkaline	1.5 V	7.9 mm x 3.6 mm	Common small alkaline button cell
AG3 / L736	Usually alkaline	1.5 V	7.9 mm x 3.6 mm	Common cross-reference naming
SR41	Silver oxide	1.55 V	7.9 mm x 3.6 mm	Same size family, steadier voltage behavior
384 / 392	Silver oxide	1.55 V	7.9 mm diameter family	Check high-drain vs low-drain version and height

The Energizer 384 data sheet identifies it as a silver-oxide SR41-family cell with 1.55 V nominal voltage and 41 mAh average capacity under its specified test conditions. LR41 alkaline cells may be cheaper, but silver-oxide options usually provide a flatter discharge curve.

Why Chemistry Matters

Alkaline and silver-oxide button cells can share a similar physical size, but they do not discharge the same way. An alkaline LR41 drops voltage more gradually. A silver-oxide SR41/384-style cell tends to maintain voltage more steadily until late in discharge. For simple LED toys or low-cost accessories, alkaline may be acceptable. For measurement devices, small sensors, and circuits where voltage affects accuracy, a silver-oxide replacement may perform better if the device allows it. For measurement-heavy designs, the current sensor guide is a useful related reference.

Low-Power Device Applications

LR41-size cells are often used where the PCB and enclosure are very small. Examples include compact thermometers, laser pointers, keychain devices, small flashers, mini meters, and low-duty sensor accessories. These devices usually depend on short active periods and long idle periods. When designing around this cell class, pay attention to leakage current. A few microamps of unnecessary standby current can materially reduce shelf life. Check ultra-low-power MCU sleep current, regulator quiescent current, pull-up resistors, sensor standby modes, and LED indicator leakage.

Design Checklist

Use a holder or contact designed for the correct 7.9 mm cell diameter and height.
Keep peak current low; these are small cells, not high-pulse power sources.
Use low-leakage reverse-polarity protection if user replacement is expected.
Choose LDOs, timers, and sensors with low quiescent current.
Test at low temperature if the device operates outdoors or in cold storage.

In a real low-power device, the battery is only one part of the design. The same troubleshooting path often leads to battery holders, PCB contacts, miniature switches, low-power sensors, LDO regulators, and timer ICs.

Evidence Asset: LR41 / SR41 Selection Rules

Device Condition	Better Starting Choice	Reason	What to Verify
Low-cost toy, light, or novelty device	LR41 / AG3 alkaline	Cost-sensitive and often tolerant of voltage decline	Holder fit and current draw
Small meter or measurement device	SR41 / 384 silver oxide if specified	More stable voltage can protect reading consistency	Manual-approved chemistry and drain type
Device stored for long periods	Check leakage and shelf-life specs	Standby current may dominate replacement interval	Sleep current and contact condition
Outdoor or cold environment	Test actual cell under temperature	Capacity and voltage change with temperature	Loaded voltage at expected low temperature

Hands-On Check Procedure

For a repair bench or product validation workflow, record a before/after photo of the cell compartment, measure the old cell voltage, clean the contacts, install the replacement, and measure loaded voltage while the device is active. Those four records create a useful evidence trail for later troubleshooting. Clear conclusion: LR41 keywords are useful for traffic, but the technical value comes from explaining when alkaline is enough and when a silver-oxide SR41/384-style cell is the safer electronics choice.

FAQ

Is LR41 the same as AG3?

They are commonly cross-referenced as the same alkaline size class. Confirm the original device requirement before substitution.

Can SR41 replace LR41?

It may fit many devices, but SR41 is silver oxide and normally has 1.55 V nominal voltage. It can be a better choice for voltage-sensitive devices, but compatibility depends on the device.

About the Author

MOZ Official Authors

The MOZ Electronics engineering team publishes practical guides on electronic components, connector standards, wireless modules, and procurement best practices for engineers and buyers worldwide.