CR2016 vs. CR2032 Batteries: Differences and Applications

"A CR2032 and a CR2025 share the same 20 mm diameter, but the extra 0.7 mm of thickness changes spring force, contact resistance, and often the entire safety margin of the battery holder."

Hommer Zhao, Founder & CEO, WIRINGO

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.

"For low-drain electronics, I treat 2.0 V as the practical end-of-life threshold on a 3.0 V coin cell, because below that point RTCs and BLE beacons start showing unstable behavior."

Hommer Zhao, Founder & CEO, WIRINGO

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.

"If the data sheet gives 220 mAh at a 15 kOhm load, do not assume you will get the same runtime at pulse loads above 15 mA; coin-cell capacity collapses fast once internal resistance dominates."

Hommer Zhao, Founder & CEO, WIRINGO

If you want to turn this topic into a production decision, review our battery life calculator, check the supporting numbers on the unit converter, and use the contact page if you need a second review before release.

FAQ

Can a CR2032 replace a CR2025 safely?

Only if the battery holder can tolerate the extra 0.7 mm thickness. Both cells are 20 mm in diameter and 3.0 V nominal, but the mechanical fit is the first pass/fail check.

What voltage is too low for a 3 V coin cell?

For many RTC, CMOS, and low-power sensor circuits, replacement should be planned around 2.0 V to 2.4 V. Below that range, reset events and clock drift become much more common.

Why does a higher-capacity coin cell not always last proportionally longer?

Capacity ratings such as 160 mAh, 220 mAh, or 620 mAh are usually measured at light loads. Pulse currents above about 10 mA to 15 mA can reduce usable runtime sharply because internal resistance rises.

How should coin cells be stored for best life?

Store them at roughly 15°C to 25°C in original packaging and avoid shorting the terminals. Good cells typically target 5 to 10 years of shelf life depending on chemistry and brand.

Are CR and BR coin cells interchangeable?

Not automatically. Both are lithium chemistries, but discharge behavior and low-temperature performance differ, so the device data sheet and holder tolerance should be checked before substitution.

What marking dimensions matter most when comparing coin cells?

Diameter and thickness matter first. In IEC naming, a CR2032 is about 20 mm by 3.2 mm, while a CR2025 is about 20 mm by 2.5 mm, which is enough to change contact force and fit.