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CR2020 Battery PANASONIC CR 2020 Lithium 3V Coin Cell Battery - O/M
Panasonic CR2020 Lithium 3 Volt Coin Cell.
Dimensions: 20mm (dia) x 2.0mm (h)
Alternative code for this battery:
This battery is no longer available. The only alternative would be to use the CR-2016 battery, which is 4mm thinner than the CR-2020, and either adjust the contacts or pad the battery with conductive material, such as tiinfoil in order for it to make contact.