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| SR521SW | SR527SW | |
|---|---|---|
| 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 4 credit cards stacked |
| Power | 1.55 volts | 1.55 volts Same |
| Kind | Watch battery | Watch battery |
Lasts longer: SR527SW (about 50% longer)
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No. They’re the same width and power, but SR521SW is thinner. It may wobble a little and runs out about 33% sooner. SR527SW is too thick to fit where SR521SW goes.
In a pinch. They’re the same width and power, but SR521SW is thinner. It may wobble a little and runs out about 33% sooner. SR527SW is too thick to fit where SR521SW goes.
SR527SW (about 50% longer).
| SR521SW | SR527SW | |
|---|---|---|
| Diameter | 5.8 mm | 5.8 mm |
| Height | 2.1 mm | 2.7 mm |
| Nominal voltage | 1.55V | 1.55V |
| Typical capacity | 14 mAh | 21 mAh |
| Chemistry | Silver oxide | Silver oxide |
| Shelf life | 5 yrs | 5 yrs |
| Operating temp | -10 to 60 °C | -10 to 60 °C |