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| SR521SW | LR521 | |
|---|---|---|
| Size | About as wide as a pencil eraser | About as wide as a pencil eraser Same |
| Thickness | As thick as 3 credit cards stacked | As thick as 3 credit cards stacked Same |
| Power | 1.55 volts | 1.5 volts |
| Kind | Watch battery | Button battery |
Lasts longer: SR521SW (about 40% longer)
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Yes. Same size, and both fit. SR521SW lasts longer and gives steadier power, which matters for cameras, measuring tools and watches. LR521 is the cheaper everyday option.
Yes. Same size, and both fit. SR521SW lasts longer and gives steadier power, which matters for cameras, measuring tools and watches. LR521 is the cheaper everyday option.
SR521SW (about 40% longer).
| SR521SW | LR521 | |
|---|---|---|
| Diameter | 5.8 mm | 5.8 mm |
| Height | 2.1 mm | 2.1 mm |
| Nominal voltage | 1.55V | 1.5V |
| Typical capacity | 14 mAh | 10 mAh |
| Chemistry | Silver oxide | Alkaline |
| Shelf life | 5 yrs | 5 yrs |
| Operating temp | -10 to 60 °C | -10 to 60 °C |