Adafruit
CR2032 Lithium Coin Cell Battery
$1.90
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A standard CR2032 lithium coin cell battery providing 3V nominal output. This non-rechargeable cell is widely used in electronics projects, wearables, and se...
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A standard CR2032 lithium coin cell battery providing 3V nominal output. This non-rechargeable cell is widely used in electronics projects, wearables, and sewable circuits.
Specifications
- Type – CR2032 lithium coin cell (non-rechargeable)
- Nominal Voltage – 3V (starts at ~3.2V, drifts to ~2.5V over life)
- Capacity – 220 mAh (at 0.2 mA constant draw)
- Diameter – 20 mm
- Thickness – 3.2 mm
Ideal For
- Sewable coin cell holders and e-textile projects
- LED badges and wearable electronics
- Real-time clock (RTC) modules
- Small sensor projects
Warning: Button cell batteries are hazardous (new or used). Keep away from children. Button cell batteries can cause severe or fatal injuries in 2 hours or less if swallowed or placed inside any part of the body. If you suspect a child has swallowed or inserted a button cell battery, call the 24-hour Poisons Information Centre in Australia on 131 126 or in New Zealand on 0800 764 766, or contact your country's emergency department.
Resources
Jargon buster
Plain-language definitions for the technical terms used above.
- LED
- A light-emitting diode (LED) is a small electronic component that emits light when current flows through it in the correct direction. Because it only conducts one way, its polarity matters, and a through-hole LED must be soldered the correct way around to light up.
- RTC
- A Real-Time Clock keeps track of time even when the main processor is asleep or powered down, usually with a small backup battery. It matters for data logging and tracking projects that need accurate timestamps.
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