The dimensions or diameter of CR1632 and CR1620 are the same. Both are 2mm thick and 16mm in diameter. This means that CR1620 batteries will work in virtually all devices that use CR1620 batteries.
The ML1620 battery is a rechargeable lithium manganese dioxide battery with a nominal voltage of 3.0 volts and can be used in place of a CR1620 battery.
CR1632 VS CR2032
The CR1632 battery is very similar to the CR2032 or CR2025 but they are not interchangeable due to their dimensions.
CR1632 and CR2032 are almost similar and have almost the same parameters. However, their nominal capacity is different. CR1632 has 140mAh while CR2032 has 225mAh. Also, their dimensions and weight are not similar, CR2032 has a diameter of 20mm while CR1632 has a diameter of 16mm.
Lithium CR1632 battery is a very popular battery, widely used in car keys, remote control devices, toys, calculators, digital watches, CMOS battery and the like. It’s an ordinary battery and easy to get.
3-volt CR2032 lithium battery. Common battery size for most red dot sights and illuminated scopes. Weight per unit: 0.11 oz.
The CR1632 battery is very similar to the CR2032 or CR2025, but they are not interchangeable due to their dimensions. The CR1632 name indicates that the battery is 16mm wide and 3.2mm thick. It is designed for 3 V and 130 mAh capacity.