Fujitsu CR2032 Lithium Battery 3V
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CR2032 batteries are standard 3 Volt lithium batteries, commonly used in watches, car keys, electronic toys and calculators. The 20 means the battery is 20mm in diameter and the 32 means the battery is 3.2mm in thickness.
AmazonMaxell CR2032 Cell Battery - S5656, Weight: 0.0330693393 pounds, Manufacturer: Maxell