Two factory visits can produce the same positive impression and two very different answers. On the first, the discussion stays in the showroom and the certificates are presented in a folder. On the second, the coil positioning fixture is on the bench, the test record from the last production batch is printed, and the traceability list links that batch to its component lots. The second factory answers in an hour what the first will still be answering next week.
Wireless charger manufacturers in China: five checks before you commit to tooling
Five checks separate a factory that can build the product from one that can repeat it.
The platforms actually in production, the coil and magnet assembly process, the test records behind the last batch, the certification file with its market list, and the capacity position with tooling ownership. Each is verified from evidence rather than from a description.
The checks are ordered by the cost of getting them wrong. A platform mismatch wastes a quotation; a coil process that is not controlled wastes a shipment; and a certification file that does not cover the target market wastes the launch.
Check 1: the platforms actually in production
Ask what is running this month, not what the catalogue contains.
A platform in production has a stable bill of materials, a known tool, and test limits that came from real measurements. A design on a drawing has none of those. Ask for the coil arrangement, the power tier and the enclosure revision of the closest platform to your brief, then ask which parts of your specification would sit inside it and which would require a change. The answer is checkable, and it exposes whether the factory is proposing a platform or a promise.
Check 2: the coil and magnet assembly process
This is the step that decides whether units behave the same way.
The relevant question is how the coil is positioned relative to the datum the enclosure uses, and what fixture holds it there. Ask to see the fixture, and ask how the coil centre is measured on finished assemblies rather than on prototypes. A factory that answers with a fixture and a measurement is describing a process; one that answers with operator skill is describing a risk that will appear as unit-to-unit variation in the first production batch.
Check 3: the test records behind the last batch
Ask for the record, not the pass rate.
The useful document states the delivered power at the alignment position for the last batch, the limit it was compared against, the temperature rise in the shipping enclosure and the sample plan behind it. Ask how the limit was set, because a limit taken from a nominal figure rather than from characterisation data will pass units that customers return. The record also indicates whether the factory is producing at capacity or re-reading a template.
Check 4: the certification file and the market list
Certification follows the product revision and the destination, and both have to be named.
Ask which reports exist for the platform, which product revision they cover and which markets they support. A file that covers three of the four destinations adds a submission for the remainder, and a change of enclosure or shielding is assessed against the tested configuration rather than assumed equivalent. The file also records whose name appears as the responsible party, which is the item most often discovered late.
Check 5: capacity, tooling ownership and the second source question
The question is not only whether the factory can build the product, but whether it can build it again.
Ask which line the product would run on, what the current loading is in the months you need, and how a second production run would be scheduled. Where tooling is paid for by the brand, ask for the identification of the tool and the conditions under which it may be used for another customer. Where the product is built on a platform, ask how many customers already order it, because that answer sets the realistic exclusivity of the programme.
| Check | What to ask | Evidence that proves it | Red flag |
|---|---|---|---|
| Platforms in production | What is running this month? | Coil arrangement, revision, test limits | Only drawings and renders |
| Coil and magnet process | How is the coil positioned and measured? | The fixture and finished-unit measurements | Operator skill as the control |
| Test records | What did the last batch measure? | Delivered power, limits, thermal result | A pass rate without a record |
| Certification file | Which revision and which markets? | Reports with the covered revision | A certificate without a scope |
| Capacity and ownership | Which line, which months, whose tool? | Schedule and tool identification | A minimum with no capacity answer |
Documents to request before a deposit
Six documents, and each one is verifiable.
The specification the factory intends to build to, the platform or design revision, the bill of materials for the coils, magnets, shielding and power stage, the test plan with its limits, the certification file with its covered markets, and the tooling and fixture identification where the brand is paying for them. A factory that supplies these before a deposit is describing an engineering process, and the documents also give the brand something to compare between suppliers.
MOQ, lead time and the payment structure
The commercial terms should follow the technical answers.
Where the product runs on an existing platform, the minimum is set by the packaging version and the test time, and the lead time is measured in weeks. Where the enclosure is new, the moulding batch sets the quantity and the tooling sits in front of the schedule. Payment terms that match those steps – tooling before the tool, production against the approved sample – are easier to agree once the technical evidence has been seen, because both sides are pricing the same defined scope.
FAQ
How do we verify a factory without visiting it?
Ask for the same five items in writing: the platform in production, the coil fixture and its measurements, the last batch’s test record, the certification scope and the capacity answer. A video call showing the fixture and the test station substitutes for part of a visit, and the documents replace the rest. Ask for the platform in production, the coil fixture and its measurements, the last batch’s test record, the certification scope and the capacity answer.
What should we ask for before paying for tooling?
The mechanical revision that the tool will produce, the tooling identification, the ownership terms and the conditions under which the tool may be used for another customer. Paying for a tool without those four items is paying for an asset whose ownership is undefined. Ask for the mechanical revision, the tooling identification, the ownership terms and the conditions under which the tool may be used for another customer.
Is a bigger factory always the better choice?
No. What matters is whether the product will run on a line whose schedule can hold your dates, and whether the process control exists for the coil and magnet steps. A smaller factory with a controlled fixture can outperform a larger one that assigns the product to a general assembly line. What matters is whether the product runs on a line whose schedule can hold your dates and whether the process control exists for the coil steps.
How many suppliers should be compared?
Two or three, asked the same five questions and given the same specification. The comparison is only meaningful when the answers describe the same scope, which is why the documents matter more than the unit price in the first round. Compare two or three asked the same five questions and given the same specification, because the documents matter more than the unit price in the first round.
What does capacity look like in an answer?
A named line, the shift pattern, the units per shift for this product and the months already committed. Floor area and equipment lists are not capacity, because they do not say what is available in the weeks your order needs. A named line, the shift pattern, the units per shift for this product and the months already committed, because floor area says nothing about availability.
Next step
Send the specification, the target markets and the forecast to Wecent Group through the contact page. The reply names the platform or design revision that fits, states the coil and test process behind it, lists the certification scope and gives the minimum quantity with the capacity position. Related reading: wireless charger applications, OEM and ODM charger manufacturing and charger quality control. External references: Wireless Power Consortium, USB Power Delivery specification, IEC standards, EU CE marking rules, EU energy-efficient products and US Consumer Product Safety Commission.
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