CR1220 vs CR1225 vs CR1216: Mini Coin Cell Selection Guide

Published: June 22, 2026

CR1216, CR1220, and CR1225 are miniature 3 V lithium coin cells with roughly 12.5 mm diameter and different thicknesses. They are used in compact electronic devices where a 20 mm CR2032-class cell is too large. Because their thickness and capacity differ, they should not be treated as automatic replacements. For electronic component planning, this article should support categories such as coin cell holders, PCB battery contacts, RTC backup circuits, low-power MCUs, LDO regulators, and sensor modules.

Mini Coin Cell Comparison

Cell	Chemistry	Nominal Voltage	Typical Size	Energizer Typical Capacity	Design Note
CR1216	Li/MnO2	3.0 V	12.5 mm x 1.6 mm	25 mAh	Thin, compact, lower capacity
CR1220	Li/MnO2	3.0 V	12.5 mm x 2.0 mm	37 mAh	Common middle option
CR1225	Li/MnO2	3.0 V	12.5 mm x 2.5 mm	50 mAh	More capacity, needs taller holder clearance

These values come from Energizer data sheets. They are useful for comparison, but a final design should be validated with the exact battery brand, holder, load profile, and temperature range.

What the Numbers Mean

In CR1220, "12" indicates the approximate diameter and "20" indicates about 2.0 mm thickness. A CR1225 is thicker than CR1220. A CR1216 is thinner. This simple naming rule helps prevent one of the most common mistakes: choosing a replacement that has the same voltage but the wrong mechanical height.

Can CR1225 Replace CR1220?

Only if the holder and enclosure allow the extra 0.5 mm thickness. A thicker cell can improve runtime, but it can also bend contacts or prevent a cover from closing. The safer rule is to match the original cell code unless the holder data sheet explicitly supports multiple thicknesses.

Design Applications

Mini 12 mm coin cells are useful for very compact electronics: memory backup, RTC backup, remote-control boards, small tags, low-duty sensors, and miniature input devices. These loads should be low current and mostly asleep. If the device uses wireless transmission, a bright LED, buzzer, or motor, a mini coin cell may not be the best power source. Consider a larger cell, a supercapacitor for pulses, or a different battery architecture.

PCB and Holder Checklist

Choose a holder rated for the exact CR1216/CR1220/CR1225 thickness.
Verify top-contact pressure after enclosure assembly.
Keep sleep current low by selecting low-Iq regulators and ICs.
Use clear polarity markings and consider reverse-polarity protection.
Test the device near its minimum operating voltage, not only with a fresh cell.

Mini coin cell selection often leads directly into coin cell holders, board-level contacts, low-power MCUs, RTC circuits, power management ICs, LDO regulators, and sensor modules.

Evidence Asset: Mini Coin Cell Selection Matrix

Design Constraint	Likely Best Fit	Why	Validation Step
Minimum device thickness	CR1216	Thinnest cell in this 12 mm group	Confirm contact pressure with assembled enclosure
Balanced compact runtime	CR1220	Middle capacity and height	Test standby current and loaded voltage
Maximum runtime in 12 mm footprint	CR1225	Highest typical capacity among the three	Confirm holder and cover clearance
RTC or memory backup	Exact holder-supported cell	Low current makes mechanics and leakage critical	Measure board leakage before finalizing

Evidence to Capture During Testing

For a future hands-on version of this guide, capture three practical screenshots or photos: the holder data sheet showing supported cell thickness, a multimeter reading of sleep current, and an assembled-board photo showing clearance above the cell. If the device uses a low-power controller, the MSP430 ultra-low-power microcontroller guide is a useful reference for sleep-current thinking. Those assets would make this page stronger for AI citations and engineering readers. Clear conclusion: In the CR1216/CR1220/CR1225 family, thickness is the decision driver. Capacity improves as thickness increases, but only if the holder and enclosure are designed for it.

FAQ

Are CR1216, CR1220, and CR1225 the same voltage?

Yes. They are all nominal 3 V lithium manganese dioxide coin cells. Their thickness and capacity are different.

Which mini coin cell has the highest capacity?

Among these three Energizer examples, CR1225 has the highest typical capacity. It also requires more height than CR1216 or CR1220.

Can I use a thinner cell in a thicker holder?

It may not maintain contact pressure. A loose cell can cause intermittent resets even when voltage appears normal.

About the Author

MOZ Official Authors

The MOZ Electronics engineering team publishes practical guides on electronic components, connector standards, wireless modules, and procurement best practices for engineers and buyers worldwide.