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| SR721SW | LR721 | |
|---|---|---|
| Size | About as wide as a pea | About as wide as a pea 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: SR721SW (about 39% longer)
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Yes. Same size, and both fit. SR721SW lasts longer and gives steadier power, which matters for cameras, measuring tools and watches. LR721 is the cheaper everyday option.
Yes. Same size, and both fit. SR721SW lasts longer and gives steadier power, which matters for cameras, measuring tools and watches. LR721 is the cheaper everyday option.
SR721SW (about 39% longer).
| SR721SW | LR721 | |
|---|---|---|
| Diameter | 7.9 mm | 7.9 mm |
| Height | 2.1 mm | 2.1 mm |
| Nominal voltage | 1.55V | 1.5V |
| Typical capacity | 25 mAh | 18 mAh |
| Chemistry | Silver oxide | Alkaline |
| Shelf life | 5 yrs | 5 yrs |
| Operating temp | -10 to 60 °C | -10 to 60 °C |