CR1620, CR1616, and CR1632 Coin Cells: Specs and Holder Compatibility
CR1616, CR1620, and CR1632 are 3 V lithium manganese dioxide coin cells with the same 16 mm diameter but different thicknesses. That makes them easy to confuse in search results, but not always interchangeable in a real product. The holder, enclosure height, contact pressure, and required runtime determine which cell is correct. In compact designs, those choices often sit alongside power management ICs and small board-level connectors.
The naming is useful: in a CR1620, "16" indicates roughly 16 mm diameter and "20" indicates roughly 2.0 mm thickness. The same logic applies to CR1616 and CR1632.
CR1616 vs CR1620 vs CR1632 Comparison
| Cell | Chemistry | Nominal Voltage | Typical Size | Energizer Typical Capacity | Design Note |
|---|---|---|---|---|---|
| CR1616 | Li/MnO2 | 3.0 V | 16 mm x 1.6 mm | 60 mAh | Thinnest of this group |
| CR1620 | Li/MnO2 | 3.0 V | 16 mm x 2.0 mm | 81 mAh | Common compact 16 mm coin cell |
| CR1632 | Li/MnO2 | 3.0 V | 16 mm x 3.2 mm | 130 mAh | More capacity but needs taller holder clearance |
The capacity values above are from Energizer data sheets under specified test conditions. In real devices, runtime depends heavily on pulse current, sleep current, temperature, and the cut-off voltage of the ICs being powered.
Are These Cells Interchangeable?
They share diameter and voltage, but their thickness is different. A CR1616 may be too thin for a CR1632 holder. A CR1632 may be too thick for an enclosure designed around CR1616 or CR1620. Even if the cell appears to fit, poor contact pressure can cause random resets.
For repair, use the exact cell code printed on the original battery or listed by the manufacturer. For new PCB design, choose the holder first, then validate the full mechanical stack-up.
Design Notes for 16 mm Coin Cells
- Use a holder designed for the exact thickness, not only the same diameter.
- Keep radio, LED, and buzzer pulses short and infrequent.
- Use low-Iq regulators and low-leakage protection paths.
- Validate contact reliability after vibration, drop, and enclosure flex.
- Estimate runtime from the actual duty cycle, not just nominal capacity.
Best Fit by Application
| Application | Likely Cell Direction | Reason |
|---|---|---|
| Very thin remote or tag | CR1616 | Low height requirement |
| Compact sensor accessory | CR1620 | Balance of thickness and capacity |
| Longer runtime in 16 mm footprint | CR1632 | Higher capacity if enclosure allows |
| Memory backup or RTC | Any exact supported holder size | Low-current load; mechanical fit dominates |
Related Component Paths
In compact electronics, CR16xx cell selection often connects to coin cell holders, PCB battery contacts, power management ICs, low-current LDO regulators, remote-control components, and low-power sensor modules. For wireless sensing context, the wireless sensor network guide is a natural supporting article.
Evidence Asset: 16 mm Coin Cell Capacity Ladder
| Cell | Thickness | Typical Capacity | Capacity Increase vs Previous | Design Tradeoff |
|---|---|---|---|---|
| CR1616 | 1.6 mm | 60 mAh | Baseline | Lowest height, lowest capacity |
| CR1620 | 2.0 mm | 81 mAh | +35% | Small height increase for more runtime |
| CR1632 | 3.2 mm | 130 mAh | +60% vs CR1620 | Best runtime if mechanical height allows |
Design Workflow
Start with the enclosure height, then select the holder, then choose the cell. If the team chooses the cell first and discovers the enclosure cannot accept the holder, the PCB may need a late mechanical redesign. For compact electronics, the mechanical stack is often the real constraint.
Clear conclusion: CR1616, CR1620, and CR1632 are a mechanical-height family. Their search traffic should be answered with holder compatibility and PCB stack-up guidance, not only a generic battery table.
FAQ
Can CR1620 replace CR1616?
Not automatically. It is thicker. It may not fit the holder or enclosure even though voltage and diameter are similar.
Can CR1632 replace CR1620?
Only if the holder and enclosure support the extra thickness. Do not force a thicker cell into a tight holder.
Which one lasts longest?
Within this group, CR1632 has the highest typical capacity in the referenced Energizer data sheets, but actual runtime depends on the circuit load.
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