Button-cell batteries come in many types and names, often leading to confusion. Among the most common are the LR44 and SR44. At first glance, they look identical—both are small, round cells used in watches, calculators, toys, and medical devices. But are they really the same? The answer is no. While they share the same size and shape, they differ in chemistry, performance, and lifespan.
This article explores the differences between LR44 battery, helping you understand when to use each and why it matters.
LR44: Alkaline button cell, 1.5 V nominal
SR44: Silver oxide button cell, 1.55 V nominal
Size (Both): 11.6 mm diameter × 5.4 mm height
Because they share the same physical size, LR44 and SR44 are often marketed as interchangeable. However, their different chemistries lead to different performance characteristics.
Composition: Zinc anode, manganese dioxide cathode, alkaline electrolyte
Nominal Voltage: 1.5 V
Voltage Decline: Gradual drop during discharge
Capacity: Around 110–150 mAh
Cost: Very affordable
Composition: Silver oxide cathode, zinc anode, alkaline electrolyte
Nominal Voltage: 1.55 V
Voltage Stability: Maintains steady voltage until near depletion
Capacity: Around 150–200 mAh
Cost: Higher, due to silver content
LR44: Voltage decreases steadily as the battery drains. Devices may dim or weaken gradually.
SR44: Voltage remains stable until the very end, then drops suddenly. Ideal for precision devices requiring consistent output.
LR44: Typically lasts 6–12 months in watches or calculators.
SR44: Often lasts 1–2 years in the same devices.
LR44: Sufficient for toys and low-cost gadgets.
SR44: Preferred in medical devices, cameras, and professional equipment.
Because LR44 and SR44 share the same size, they can physically fit into the same devices. Many devices will function with either, but performance will vary:
Toys and Flashing Gadgets: LR44 is sufficient.
Watches and Medical Tools: SR44 is better due to stable voltage.
Photography Equipment: SR44 ensures accuracy in light meters.
Calculators: Both work, but SR44 may last longer.
So while they are interchangeable in terms of fit, they are not equal in terms of performance.
LR44: Inexpensive, often sold in bulk multipacks. Best for devices with frequent replacements or low importance.
SR44: Costs more, but pays off with longer lifespan and reliability. Best for critical or precision devices.
Consumers must weigh whether upfront savings outweigh the benefits of longer-lasting performance.
LR44 and SR44 also go by different equivalent names:
LR44 equivalents: AG13, A76, L1154, 1166A
SR44 equivalents: 357, 303, SR44SW (low-drain), SR44W (high-drain)
Packaging often lists multiple codes, adding to confusion. Always check whether the battery is alkaline (LR) or silver oxide (SR).
LR44 (Alkaline): Cheaper, but shorter lifespan means more waste.
SR44 (Silver Oxide): Contains silver, which is valuable and recyclable. Produces less waste due to longer lifespan.
Both types should always be recycled to prevent heavy metals and chemicals from entering the environment.
The device is a toy, novelty gadget, or laser pointer.
Cost is the main priority.
Frequent replacements are acceptable.
The device requires accuracy, like a watch, medical thermometer, or glucose meter.
You want longer lifespan and less frequent battery changes.
Stable voltage output is critical.
“They are exactly the same.”
Not true. They differ in chemistry and performance.
“SR44 will damage devices meant for LR44.”
False. Both provide safe voltages; SR44 simply performs better.
“Rechargeable versions exist.”
Rechargeable cells (LIR44) exist but operate at 3.6–3.7 V, making them unsuitable replacements.
The LR44 and SR44 batteries may look the same, but their performance tells a different story. The LR44 is an affordable, widely available option for toys and everyday gadgets. The SR44, with its silver oxide chemistry, delivers longer life and stable voltage, making it the better choice for precision devices.
While they are physically interchangeable, the decision comes down to cost versus reliability. For casual use, LR44 is fine. For critical applications, SR44 is the superior option.
By understanding these differences, consumers and professionals alike can make informed choices and ensure devices run reliably and accurately.
