This 4-cell pack from Energizer is an economical way to buy replacement button batteries for your key fobs, heart monitors, toys and other devices. It contains 4 reliable, lightweight coin batteries from a trusted name in portable power.  You can store the spares for up to 8 years and they'll still be ready when you need them. Because they're lithium based, these cells are efficient in temperatures from 60C down to -20C. Lithium chemistry also makes them lightweight. Size of battery - 20mm x 3.2mm Also known as - CR2032, BR2032, SB-T15

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