3 volt coin batteries
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Across the listings shown, capacities include about 90 mAh, 130 mAh, 185 mAh, 265 mAh, and 620 mAh.
Listings describe several child-safety measures: a color-changing indicator that dyes the mouth blue on saliva contact, a non-toxic bitter coating on the cell, and child-resistant or child-secure packaging.
Several listings state a temperature range of about -22°F to 140°F. Specific operating or storage temperature ratings can vary by product, so check the individual listing for exact details.
3V coin batteries are shown used in key fobs and keyless entry systems, remote controls, glucose and heart-rate monitors, watches, toys and games, thermometers, wireless/security cameras, calculators, and some small cameras and electronics.
The listings consistently label these batteries as single-use (non-rechargeable).
Review summaries commonly report that the batteries match expected sizes and fit devices, reliably restore device function, and are generally considered good quality with acceptable value.