A CR2032 battery is a flat battery, about the size of a thick US0.25$ piece: 20 mm across, 3.2 mm thick. The name of the battery is derived from these dimensions: 20 and 3.2 gives 2032. Other batteries in the CR20XX series are CR2020 (2.0 mm thick) and CR2016 (1.6 mm thick). All these batteries are 3 volt (nominal).
This is not AAA-sized (10.5 mm across, 44.5 mm long). Also, an AAA battery is 1.5 volt (nominal).
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