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The CR2032 is a 3V lithium coin cell battery, one of the most widely used battery sizes in small electronics, from car key fobs and calculators to the backup battery socket on real-time clock modules used in Arduino and similar projects. Its lithium chemistry gives it a genuinely long shelf life and low self-discharge rate, which matters for a battery that might sit in a device drawing only a tiny trickle of current for months or years between actual use.
That combination of long shelf life and steady, reliable voltage is exactly why it's the standard choice for keeping a real-time clock chip ticking, or a small memory circuit powered, even when the main device it's fitted to is switched off or disconnected from its primary power source.
Being a standard, widely manufactured size, CR2032 cells are stocked almost everywhere, from electronics suppliers to supermarkets and pharmacies, making replacement straightforward wherever a project ends up being used. The round, flat coin shape fits the countless battery holders designed around this exact size, whether on a hobby RTC breakout board or inside a manufactured consumer device.
Because it delivers a steady 3V output rather than the roughly 1.5V of common alkaline cells, it's important to check that whatever circuit uses it is actually designed for a 3V lithium coin cell rather than a different voltage or chemistry before fitting it.
Anyone building or maintaining a project with a real-time clock module, a small backup memory circuit, or any device using the standard CR2032 holder will need one of these on hand, and it's worth keeping a small stock given how frequently this exact size turns up across different projects.
3V.
Backup power for real-time clock modules, key fobs, calculators and similar small devices.
Lithium.
Yes, lithium coin cells are known for long shelf life and low self-discharge.
Yes, it is one of the most widely available coin cell sizes.
| Brand | Generic |
|---|---|
| Selling unit | PCS |
