Choose a coin cell battery holder by exact cell dimensions, PCB orientation, retention and assembly process. Diameter alone is not enough. A nominal 20 mm holder can still be wrong for the cell height, insertion path, stacked-cell count or production line. Qualify the holder and cell as one electromechanical interface.
Coin cell holder formats compared
| Holder format | Where it fits | Engineering advantage | Main review point |
|---|---|---|---|
| Horizontal SMT holder | Automated, low-profile PCB assembly | Tape-and-reel and pick-and-place options are available | Reflow compatibility, board edge access and loaded height |
| Vertical through-hole holder | Dense boards with limited horizontal area | Small footprint and accessible top or side loading | Enclosure height, insertion direction and vibration retention |
| Open retainer or contact clip | Lowest profile and constrained layouts | Minimal plastic and direct PCB integration | Polarity, exposed-cell protection and removal method |
| Enclosed or wired holder | Remote mounting, service compartments and harnessed assemblies | Flexible placement and easier replacement | Lead gauge, connector, strain relief and short-circuit protection |
JBWCELL’s battery holder range currently includes CR1220 and CR2032 formats with SMD and tip/lead configurations. The holder category is a starting point; the drawing and the device assembly flow determine the released part.
Start with the exact cell and tolerance stack
The numeric size code is useful, but it is not a complete mechanical specification. A CR2016, CR2025 and CR2032 share a 20 mm nominal diameter and differ in height. Some holders accept several heights through spring travel; others are designed for one cell or for stacked cells. The contact must maintain force without damaging the can or allowing intermittent power.
Keystone’s official coin-cell holder catalog shows the variation. Certain 20 mm products accept 2016, 2020, 2025 and 2032 cells, while the permitted number of cells, pad pattern and orientation change by part number. The same catalog separates horizontal and vertical designs and describes polarity features and spring tension. “Holder for 20 mm cells” is therefore not a release-ready line item.
Put the cell manufacturer drawing, holder drawing and PCB footprint into the same tolerance review. Check maximum cell height and diameter, spring travel, insertion clearance, enclosure wall, nearby components and the tool or finger path needed for removal.
Match the holder to the production process
Assembly volume changes the preferred construction. A prototype can tolerate hand insertion and manual soldering. A production line may require tape-and-reel presentation, vacuum pick-up, reflow-compatible materials and a cell inserted after board wash. Through-hole designs may suit wave solder or manual processes but add board operations.
Keystone’s Auto-In/EZ-Out 2032 example combines pick-and-place handling, tool-free removal, polarity control and shock/vibration retention. Those are specific product features, not assumptions to apply to every SMT holder. Ask the supplier which packaging, solder process and insertion sequence the exact part supports.
PCB washing deserves its own line in the process review. Panasonic’s lithium battery handbook warns that some detergents can damage holder materials and recommends testing the actual washing process. A plastic that passes the solder profile can still crack after the wrong cleaning chemistry.
Retention, polarity and service access
Portable, automotive and industrial products can experience shock and vibration that a desk prototype never sees. Retention must be checked with the real cell, board and enclosure. A locking flange, dual spring or stabilization tab may be appropriate, but the required solution depends on the acceleration profile and insertion method.
Keystone’s 2026 locking vertical-entry holder uses a locking flange and polarity tab for high-shock and vibration applications. It demonstrates two separate functions: keeping the cell in place and preventing reverse insertion. Both need validation. A holder that retains well but allows reversed polarity has not solved the interface.
Service access can conflict with retention. A cell must not fall out during use, yet a field technician may need to replace it without damaging the PCB. Define whether removal is tool-free, how many replacement cycles are expected, and whether the enclosure controls access. For products where replacement is not allowed, welded terminals may be more appropriate; compare that route in the battery tabs and PC pins guide.
Electrical checks that mechanical drawings miss
A holder adds two contact interfaces and PCB joints to the battery path. The open-circuit voltage can look correct while contact resistance produces a pulse-voltage drop. Measure voltage at the load during the worst pulse, after vibration, after thermal cycling and near the end of the intended service life.
| Validation item | What to measure or inspect | Failure it exposes |
|---|---|---|
| Dimensional fit | Insertion, seating, spring travel and enclosure clearance | Cell not fully seated or plastic overstressed |
| Polarity | Reverse-insertion prevention and PCB marking | Field assembly error or reverse voltage |
| Loaded voltage | Drop at normal and peak current | Contact resistance or weak spring force |
| Shock and vibration | Continuity logging and post-test retention | Momentary reset or ejected cell |
| Assembly exposure | Reflow, wave solder and wash process | Warped housing, cracked plastic or damaged plating |
| Replacement access | Insertion/removal path and repeated service | Board damage, shorting or unusable field procedure |
What to put in a holder RFQ
- Exact battery manufacturer, model, diameter, height and terminal face
- Horizontal or vertical orientation and maximum assembled height
- SMT, through-hole, open retainer or wired/enclosed construction
- PCB footprint, keep-out area and insertion/removal direction
- Pick-and-place, reflow, wave-solder, hand-solder and wash requirements
- Normal current, peak pulse, minimum device voltage and permitted contact drop
- Shock, vibration, temperature, humidity and service environment
- Polarity protection, insulation and short-circuit controls
- Prototype quantity, annual volume, packaging and replacement-cycle target
For existing 20 mm projects, the CR2032 holder with tips provides one configuration to evaluate. Smaller designs can start from the CR1220 SMD holder. Neither link replaces a drawing review.
Frequently asked questions
Will one 20 mm holder fit CR2016, CR2025 and CR2032?
Some holders are designed for multiple 20 mm cell heights, but others are model-specific or support different stacking counts. Check the exact holder drawing, spring travel, polarity feature and approved battery list before release.
Is SMT or through-hole better for a coin cell holder?
Neither is universally better. SMT can suit automated low-profile assembly; through-hole can provide a different mechanical layout and process flow. Choose from the board orientation, production method, shock requirement, enclosure clearance and service access.
Can I solder directly to a bare coin cell instead of using a holder?
Do not make direct soldering to the bare can the default sourcing plan. Use a replaceable holder or a cell supplied with manufacturer-approved welded tabs, pins or leads, then validate the terminal and PCB process.
Qualify the holder with the full assembly
Send JBWCELL the exact cell, PCB layout, load and pulse, assembly process, temperature and vibration conditions, service method, termination and annual volume. The custom battery design checklist can help structure the wider electrical brief, and the enquiry form can be used to request the holder drawing and sample configuration.
