When you place a custom OEM order, it is reasonable to want to know where it is and what has been checked at any point. A professional factory does not simply wait until the goods are finished to tell you they are done; it runs production through a series of defined quality gates, each with a check, a record and a decision point. This structured approach is what separates a reliable supplier from one that delivers surprises at shipment.
This FAQ walks through the typical milestones in a custom order, from the moment materials arrive to the moment the container is sealed. It explains what happens at each checkpoint, what the customer can review, and how the system catches problems early rather than at the loading dock.
Q: What happens at the incoming material stage?
Before production even begins, the incoming quality control team checks the materials that arrive from suppliers: cells, PCBA boards, magnets, housings, packaging and accessories. They verify that each item matches the approved specification and the approved sample, and cells are sorted by capacity and internal resistance into tight groups. Materials that fail inspection are rejected and returned rather than used. This stage is critical because bad input materials cannot be fixed later; stopping them at the door is the foundation of a quality batch.
Q: What is the first checkpoint after production starts?
The first checkpoint is the first-article inspection. After the line is set up, the first small batch of units is built and set aside for inspection against the sealed sample. The quality team checks dimensions, appearance, output performance, labeling and function, and the customer often receives photos or a short video to approve. Only after this first batch is confirmed does the line release for full production. This catches setup or tooling errors at the cheapest possible moment, before thousands of units are built on a wrong setting.
Q: How is quality controlled during production?
In-process quality control runs throughout the build. Every unit goes through automated charge and discharge testing that records its actual capacity and internal resistance. Patrol inspectors sample units at fixed intervals to check appearance, labeling and dimensions, and the results are logged. If a measurement drifts toward the control limit, the process is corrected before a defective batch accumulates. This staged approach means the line is continuously watched rather than inspected only at the end, so drift is detected early and fixed on the spot.
Q: What tests does each power bank unit go through?
A typical power bank is tested for charging and discharging performance, output voltage and current, fast-charge protocol handshake, wireless coil output, button and indicator function, and basic safety. TWS earbuds add pairing tests, microphone and speaker checks, and charging-case contact tests. Rechargeable cells go through capacity grading and internal resistance checks. These tests are automated or standardized so that every unit receives the same checks, and the results are recorded per batch rather than guessed.
Q: What happens at the outgoing quality stage?
Once production is complete, finished units move to the warehouse and wait for the outgoing quality control inspection. The OQC team samples the batch to an accepted sampling standard, checking appearance, function, accessories, packaging and shipping marks, and reviews the production test records. A quality report is issued. The customer may also request a third-party inspection at this stage, and the container is loaded only after inspection passes. This final gate confirms that the shipment matches both the order and the sealed sample.
Q: Which milestones can the customer participate in?
The customer has natural touchpoints at several milestones. They approve the sample before production starts, review the first-article photos, receive the production progress update, and can witness or request a pre-shipment inspection. Many customers also schedule a factory audit or remote video tour at a convenient point. These touchpoints are built into the workflow so the buyer is never guessing; they receive confirmation at each gate rather than a single message at the end.
Q: What reports and documents does the customer receive?
For a custom order, the customer typically receives the order confirmation, the approved sample record, first-article photos, batch test reports showing capacity and resistance data, the outgoing inspection report, and the export documents including the commercial invoice, packing list and the relevant transport certificates. For repeat orders, the same documentation package is reused without rework. These records support the buyer's own quality file and make reselling under their own brand straightforward.
Q: How are defects handled if they are found?
If the inspection finds defects, the response depends on the stage. At the first-article stage, production pauses while the cause is corrected. During in-process checks, the affected units are quarantined and the process is adjusted. At outgoing inspection, the defective proportion is evaluated against the agreed tolerance; units that fall outside acceptable limits are reworked or replaced. The customer is informed of the finding and the corrective action. Because defects are caught at the earliest checkpoint, they are usually corrected cheaply rather than discovered at the customer's warehouse.
Q: Can the customer change something during production?
Changes during production are handled through a formal change process rather than accepted informally. If a change is requested after production has started, the engineer assesses the impact on cost, schedule and quality, and confirms the new settings with the customer before applying them. A change made casually on the floor without documentation is how consistency breaks down. This discipline means that even when customers adjust a design mid-project, the result still matches a controlled, agreed specification.
Q: How does Zishine structure these milestones for its customers?
Zishine runs every custom order through the same documented sequence: incoming material inspection, first-article approval, automated in-process testing and patrol checks, outgoing sampling inspection, and pre-shipment support for third-party inspection. We provide the customer with progress photos and reports at each key milestone, and we keep the quality file ready for review on request. This transparent, staged process gives buyers confidence that their order is being controlled at every step, and it is the reason our repeat customers place follow-up orders without surprise, knowing the next shipment will match the last one.
