Button Cell (Coin Cell)


Button cells maybe also be known as coin cells or watch batteries.


The insulated top cap of a button cell is the negative terminal, the base is the positive terminal.

Internal Resistance

The internal resistance of a coin cell battery starts of at a rather large 10Ω. This then rapidly increases as the batteries energy is consumed. Where high pulse currents are needed, coin cell batteries can be used in conjunction with high-valued capacitors.

A rule of thumb for coin cell batteries is that 10mA is the maximum current draw.


Silver Cell

Silver cells have a very stable output voltage over the lifespan of the battery.

Common Types

CR2032. CR2025.

Posted: November 4th, 2014 at 1:44 pm
Last Updated on: November 4th, 2014 at 6:00 pm

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