A custom wireless charger sample is ready for approval only when its full configuration is frozen: charger hardware, input adapter and cable, firmware or control revision, device-and-case set, mechanical arrangement, labels, packaging, claim evidence, test conditions, and written pass rules. A successful demonstration with one phone is useful evidence, but it is not a complete acceptance decision.
Use the matrix below to decide whether a sample is accepted, revised, or rejected before a pilot order. It does not impose one universal charging-power, efficiency, temperature, or safety limit. Those criteria must come from the agreed product specification, applicable standards, qualified evidence, and the exact intended market.
Treat the sample as a complete charging system
Wireless charging behavior can change when the input adapter, input cable, receiver device, case, coil position, magnetic alignment, ambient conditions, firmware, or load state changes. Record those items before testing. If the supplier sends a preferred adapter or cable, identify whether it is included in the finished package or used only for evaluation.
Start from the intended product format: pad, stand, foldable travel unit, magnetic charger, car mount, or multi-device station. List every charging position and included accessory. If the product has several outputs, test and document the agreed simultaneous-use cases instead of extrapolating from one position used alone.
Browse the current wireless charger categories to narrow the physical route before writing the sample plan. The category owns product discovery; this matrix owns the later decision about one identified custom sample.
Custom wireless charger sample acceptance matrix
| Decision area | Freeze before testing | Acceptance method | Evidence record | Reapproval trigger |
|---|---|---|---|---|
| Sample identity | Model, hardware revision, control or firmware revision, supplier, sample ID, and date | Compare labels and configuration with the quotation and sample record | Identity sheet and photographs | Any hardware, control, firmware, or supplier change |
| Input system | Adapter, cable, connector, declared input, and whether items are included | Run the agreed use cases with the named input set | Input-equipment list and measured observations | Adapter, cable, connector, or input requirement changes |
| Receiver matrix | Device models, receiver types, software state where relevant, and battery-state conditions | Use each agreed device in the defined positions and scenarios | Device-by-result matrix | Claimed compatibility list or receiver configuration changes |
| Case and alignment | Case models or dimensions, magnetic accessories, orientation, and placement method | Check start, continuity, physical stability, and repeatable placement | Case/alignment result sheet with photos | Housing, coil, magnet, stand, or case-claim changes |
| Charging claim | Exact wording, device scope, power claim, conditions, and excluded combinations | Use the agreed measurement method and complete system | Claim-to-evidence table | Power, device, input, firmware, or marketing wording changes |
| Qi certification statement | Qi Certified, Qi2, compatible, or no certification claim; exact registered identity where claimed | Check official records and match brand, product name, type number, and physical identity | Database record or certificate reference with checked date | Model, brand, type number, product construction, or claim changes |
| Thermal behavior | Test conditions, locations, method, duration, device state, and evidence-based limits | Record temperatures and operating behavior under the approved method | Time-and-condition result sheet | Power, coil, control, housing, input, firmware, or ventilation changes |
| Declared protection behavior | Applicable functions, safe test method, expected response, and responsible reviewer | Perform only the approved checks and refer qualified tests to the proper laboratory | Function/result record and supporting report scope | Protection circuit, coil, control, firmware, or enclosure changes |
| User interface | Indicators, controls, sounds, display behavior, and instruction wording | Run start, active, complete, error, and recovery states defined by the specification | State table, photos, and video where useful | Indicator, control, firmware, or instruction changes |
| Mechanical configuration | Dimensions, finish, hinge or stand positions, magnets, feet, vents, and moving parts | Inspect dimensions, stability, movement, fit, and agreed durability checks | Drawing comparison and mechanical result sheet | Tooling, material, magnet, hinge, finish, or dimension changes |
| Labels and packaging | Model, ratings, markings, claims, language, barcode, included items, and artwork revision | Compare the complete pack-out with the approved files and sample identity | Pack-out checklist and artwork record | Product claim, market, rating, model, artwork, or included-item changes |
| Repeatability | Sample count, repeated scenarios, allowed variation, and deviation process | Repeat critical checks under the same recorded conditions | Sample-by-sample results and deviation log | Unexplained variation or non-repeatable setup |
Each row needs a named owner and a disposition. A blank result is not a pass. If a test is not applicable, state why and who approved that scope decision. If the method or equipment changes during evaluation, record the new condition and decide whether earlier results remain comparable.
Control the device, case, alignment, and input matrix
Choose receiver devices from the intended customer or deployment population, not from whichever phones happen to be available. Record the exact device and case identity, operating-system or firmware state when relevant, starting battery state, orientation, placement method, input adapter, and input cable.
For a magnetic product, separate mechanical alignment from charging protocol and certification. A ring or magnet can improve placement without proving a particular Qi or Qi2 claim. Record whether the magnet is built into the device or case, whether the charger holds the device in each intended orientation, and whether placement is repeatable across the agreed cases.
For a stand or multi-device unit, define the intended positions and simultaneous-use scenarios. A phone result does not prove a watch or earbud position, and a single-output result does not prove the behavior of all outputs used together. Test only the combinations included in the approved claim set.
Verify claim and certification scope separately
The Wireless Power Consortium distinguishes products that are Qi Certified from claims such as “Qi compliant,” “Qi compatible,” or “Works with Qi.” WPC states that a professional buyer can ask for a Certificate of Registration and verify the product in its certified-product database. The certificate URL should resolve to the same physical product, brand name, product name, and type number.
Do not match only a familiar outer housing. The registered identity and the proposed custom product must align. A brand change, type-number change, internal change, or rebranding route can affect how the certification record applies. Ask the responsible party to explain the exact route and keep the checked record with the approved sample.
WPC’s published certification process includes compliance testing at an authorized test laboratory and interoperability testing at an interoperability testing center, followed by WPC review. That official process is different from a buyer’s sample acceptance. The buyer matrix checks the purchased configuration and commercial claim; it does not recreate or replace certification testing.
Certification also has limits. WPC states that its certification is not a product endorsement and does not guarantee product safety; manufacturers remain responsible for applicable product-safety regulations. Therefore, keep market-specific safety, electromagnetic-compatibility, labeling, and other product evidence in their own review tracks.
Record thermal and declared protection behavior without inventing limits
Temperature results are meaningful only with conditions. Record the ambient environment, device, case, starting battery state, input adapter and cable, placement, charging duration or state, measurement equipment, measurement locations, and any concurrent outputs. Compare the results with the evidence-backed acceptance criteria approved for the project.
Do not publish or approve a broad “stays cool” claim from one short run. A custom housing, surface material, coil position, magnet arrangement, control revision, or input configuration can change thermal behavior. Reopen the check when one of those fields changes.
For protection functions, list what the supplier declares, the applicable technical evidence, and the safe method for any buyer-observable check. Tests involving abnormal conditions, electrical hazards, or specialized apparatus belong with qualified personnel and laboratories. A bench observation can confirm an indicator or expected state transition; it cannot substitute for the full applicable test program.
Carry the accepted sample into the pilot lot
Connect the sample ID to a controlled configuration record: hardware and firmware, input system, device-and-case matrix, drawings, evidence references, thermal method, declared protection functions, labels, artwork, packaging, and approved deviations. That bundle is the pilot baseline.
During the pilot, compare more than appearance. Verify model and rating labels, input accessories, functional states, mechanical assembly, charging behavior under selected checks, pack-out, and configuration traceability. Record nonconformities before rework, then record the correction and retest. An undocumented adjustment hides whether the process can repeat the approved sample.
Define change rules before recurring production. Coil, magnet, control IC, firmware, housing material, thermal interface, input accessory, label, artwork, and supplier changes may affect different parts of the acceptance or evidence set. The change request should state what changed, why, when it takes effect, which lots are affected, and what must be rechecked.
Use three clear outcomes: accept, revise, or reject
Accept when mandatory rows pass, the evidence matches the exact configuration, deviations are closed, and the pilot baseline is complete. Revise when the concept remains suitable but a requirement, sample, document, or claim needs controlled correction and another defined check. Reject when a mandatory function cannot be demonstrated, the product identity is unreliable, a material evidence gap cannot be resolved, or repeated behavior remains outside the agreed criteria.
Do not use a lower price to convert an unclosed technical deviation into an acceptance. Commercial negotiation can change the requirement deliberately, but the revised requirement and claim set must be recorded before approval.
Prepare the custom project route
Send the supplier the product format, intended devices and cases, input system, destination markets, required claims, certification route, mechanical and branding inputs, packaging, sample matrix, pilot expectations, forecast, and requested evidence. Ask the response to identify exclusions and supplier-proposed alternatives.
When the matrix is defined, send Keku the custom wireless charger project brief. Keep the initial conversation focused on open configuration and evidence decisions before asking the sample to serve as the specification.
Official sources
- Wireless Power Consortium — Qi Certified Products (checked July 31, 2026).
- Wireless Power Consortium — Qi Certification Process (checked July 31, 2026).