LR41 battery equivalents
The LR41 is a 7.9 × 3.6 mm silver-oxide cell, used in quartz watches, and as the alkaline LR41 in thermometers and small toys. It's sold under several names: SR41SW, SR41W, 384, 392, AG3, 192, L736, 392A, SR736, SR41.
Equivalents
| Sold as | Type | In a watch |
|---|---|---|
| SR41SW, 384 | Silver oxide, low drain | Best for an ordinary analog quartz watch |
| SR41W, 392 | Silver oxide, high drain | Works in any watch, and suits one with a backlight, alarm or chronograph |
| LR41, AG3, 192, L736, 392A | Alkaline, 1.5 V | Fits, but runs down sooner and the voltage sags; use only in a pinch |
| SR736, SR41 | Older or alternative codes | Same size; check the chemistry on the pack |
Look-alikes that won't fit
These are also 7.9 mm across, so they look right in the pack, but the thickness is different. They aren't substitutes.
- 346 SR712SW1.25 mm thick (-2.35 mm)
- 341 SR714SW1.45 mm thick (-2.15 mm)
- 315 SR716SW1.65 mm thick (-1.95 mm)
- 362 SR721SW2.1 mm thick (-1.5 mm)
- 397 SR726SW2.6 mm thick (-1 mm)
- 329 SR731SW3.1 mm thick (-0.5 mm)
- 393 SR754SW5.4 mm thick (+1.8 mm)
Never use a lithium coin cell in its place. Lithium cells run at 3 volts, twice what a silver-oxide watch movement expects.
Getting a LR41 changed
Watch shops in our directory list battery changes from $4.99 to $115, with a median of $15, usually done while you wait. A shop has the tools to open a screw-down caseback without marking it, and can replace the gasket and pressure-test a water-resistant watch. 455 shops in the directory list battery replacement. To do it yourself, follow how to change a watch battery.
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Questions
- Is 384 the same as 392?
- They're the same size (7.9 × 3.6 mm) and the same silver-oxide chemistry. The 384 (SR41SW) is the low-drain version for ordinary analog watches; the 392 (SR41W) is high-drain, for watches with a light, alarm or chronograph. The 392 works in any watch that takes a 384.
- Is LR41 the same as SR41SW?
- Same size, different chemistry. LR41 (also sold as AG3) is alkaline and SR41SW is silver oxide. The alkaline cell fits, but it holds about 25–38 mAh against 38–45 mAh and its voltage drops as it drains, so a watch runs a shorter time on it.
- Can I use a 329 instead of a LR41?
- No. Both are 7.9 mm across, but the 329 is 3.1 mm thick and the LR41 is 3.6 mm. A thinner cell won't press against the contacts, so the watch won't run reliably.
- How long does a LR41 battery last?
- In a typical analog quartz watch, two to five years. It holds about 38–45 mAh; a running chronograph, a backlight or an alarm drains it faster. Unused cells keep for several years in the pack.