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The CR1620 battery is a lithium battery. This battery is small and is meant for watches and other devices that take small coin size batteries. It can be found online.
As far as I have seen, the "CR" in the CR1620 battery number denotes a manganese dioxide lithium chemistry within the battery.
CR1620
another CR2032 battery (from a different brand) would work flawlessly. if you are asking about substitutes, than any 3v or pair of 1.5v batteries would work, as long as you could fit them inside the device. Some brands called the same batteries as 2032. You can check out the <a href="http://www.24hrbatteries.com/shop/pcs-lithium-2032-battery-free-shipping-p-92.html">2032 Lithium Battery</a> here.
2032 3V Lithium Battery
One can purchase the 2032 battery from Walmart where it is available for $11.54. One can also purchase this battery from Amazon, eBay, CVS and in the UK from Argos.
The two batteries may look the same but have slightly different power outputs. Interchanging them could damage the device by putting out to much or to little power.
Yes, you can use it if your device has a compartment big enough to hold it. The 2032 is twice as thick as the 2016.
There should be a little Phillips screw on one side of the plastic of the key toward the bottom. Just unscrew it and pry it off with your nail and replace the battery with what is in there, it is probably a cr 2032.
The difference is in the height and capacity. The 2016 is 1.6mm (hence the 16), and the 2032 is 3.2mm (again, 32). The capacity on the 2016 is only 80mAh, and the 2032 is 200mAh. They are both 3V batteries. So if you replace a 2016 with a 2032 it will work fine, and will last longer, but you need to make sure that it will actually fit in the battery holder since it's twice as thick.
CR 2032, 3V lithium battery