CR2016 vs. CR2032 Batteries: Differences and Applications

The CR2016 and CR2032 look similar and share the same diameter, leading many to assume they're interchangeable. However, significant differences make proper selection important.

Specifications Comparison

Specification	CR2016	CR2032
Voltage	3V	3V
Diameter	20mm	20mm
Thickness	1.6mm	3.2mm
Capacity	90mAh	220mAh
Weight	1.8g	3.0g

Understanding the Difference

The CR2032 is exactly twice as thick as the CR2016 (3.2mm vs 1.6mm). This translates to more than double the capacity. The naming convention makes this clear: the last two digits represent thickness in tenths of a millimeter.

Why Thickness Matters

Device manufacturers design battery compartments for specific battery heights. Using a CR2032 in a CR2016 slot will prevent proper closure and potentially damage the device. Conversely, a CR2016 in a CR2032 slot may not make reliable contact with terminals.

Typical Applications

CR2016: Ultra-thin devices, slim remote controls, fitness bands, some car key fobs, thin calculators, and medical sensors where minimal profile is essential.

CR2032: Computer CMOS batteries, standard key fobs, watches, glucometers, electronic scales, and most general consumer electronics.

Battery Life Comparison

With approximately 2.5× the capacity, CR2032 provides significantly longer life. In a device drawing 0.1mA continuously, CR2016 lasts about 37 days while CR2032 lasts about 90 days.

Can You Stack Two CR2016s?

While two CR2016 batteries equal the thickness of one CR2032, stacking them creates 6V instead of 3V—potentially damaging your device. Never stack batteries unless specifically designed for it.

Selection Guidelines

Always match the battery specification in your device manual. When designing circuits, choose CR2016 for space-constrained applications and CR2032 when battery life is priority.