Single CR1620 3Volt Lithium Battery.
Part No. CR1620.
16mm diameter, 2.0mm thick.
Common battery on many computer motherboards and similar equipment.
Used in many Mazda key fobs.
Various brands are stocked, so the part received may be in a different package to those shown in the photos.
We have been supplying appliance parts to the trade and retail for over 25 years. Buy with confidence.