LR44 vs SR44
These two cells are physically identical at 11.6 × 5.4 mm. The difference is chemistry: the SR44 is silver oxide, holds a steadier voltage for longer and stores more energy, while the LR44 is alkaline and costs a fraction as much.
These two are the same size, so both will fit. The SR44 costs more but holds a steady power level until it dies, which matters in a watch or a light meter. The LR44 is cheap and fades gradually — fine for a toy, a calculator or a thermometer. If your device came with an SR44, stick with it.
- Verdict:
- SR44 for anything precise, LR44 for anything cheap
- Interchangeable:
- usually, in low-drain devices
Side-by-side specifications
| Specification | LR44 | SR44 |
|---|---|---|
| Chemistry | Alkaline | Silver Oxide |
| Type | Button Cell | Button Cell |
| Nominal voltage | 1.5 V | 1.55 V |
| Diameter | 11.6 mm | 11.6 mm |
| Height | 5.4 mm | 5.4 mm |
| Typical capacity | 110–130 mAh | 170–200 mAh |
| Rechargeable | No | No |
| Also sold as | AG13, A76, L1154, 157 | 357, 303, SR44W, V357 |
Size comparison
Both cells share an identical 11.6 × 5.4 mm footprint, so physical fit is not the deciding factor here.
Chemistry
LR44 is alkaline (1.5 V nominal). SR44 is silver oxide (1.55 V nominal). Silver oxide keeps its voltage nearly flat until it is exhausted; alkaline sags gradually from the first day.
Runtime
SR44 typically delivers 170–200 mAh against 110–130 mAh for the LR44 — roughly 50% more usable energy in the same shell.
Compatibility
In most low-drain devices an SR44 drops straight into an LR44 socket. Devices calibrated to a specific voltage — light meters, some medical instruments — should use the chemistry named in the manual.
Can I use a SR44 instead of a LR44?
Physically, yes — the SR44 occupies exactly the same space as the LR44. The question is electrical: the SR44 runs at 1.55 V against 1.5 V, and uses silver oxide rather than alkaline. For everyday low-drain devices such as toys, calculators and remotes, that difference is not usually a problem. For calibrated instruments, follow the manual.
Check before you swap. Batteries with similar dimensions are not always interchangeable. Always verify voltage, chemistry and the requirements printed in your device manual before fitting a replacement.