01Why audit: front-load the risk
Sourcing risk is not only price but the gap between what is promised and what is done: samples pass yet mass production drifts, capacity gets crowded out by larger customers and lead times slip, or a missing quality system causes batch-to-batch inconsistency. A factory audit is about answering three questions with verifiable evidence: does this factory really exist with real capacity in this category, can it repeatedly reproduce sample quality, and does it understand the compliance and market-access rules of your target market. Confirming these at RFQ and sampling stage is far cheaper than fixing problems after mass production.
- Does it really exist with real capacity in this category
- Can it repeatedly reproduce sample quality
- Does it understand target-market compliance and access
02Three levels: document / remote / on-site
Not every purchase needs an on-site visit. In increasing order of effort there are three levels: document review (business licence, system certificates, test reports, capacity and equipment lists — cheapest, fully remote), remote video audit (a live walk-through of lines, warehouse and test lab along a preset route, with timestamps and workstation footage), and on-site inspection (a third party or your own staff checking documents against physical reality and interviewing key roles). Screen out obvious mismatches with document review first, then run remote or on-site audits on the shortlist so effort concentrates on the few suppliers you will actually order from.
- Document review: cheapest, fully remote
- Remote video: live walk-through along a preset route
- On-site: cross-check documents against physical reality
03Qualification and system documents
Document review should request material that can be cross-checked: legal entity (business licence, whether the scope covers the category), quality and environmental systems (ISO 9001 and, where applicable, IATF 16949), product certifications and test reports (per target market), and capacity and equipment lists. The key is cross-verification: does the licence address match the site or video, is the certificate valid and does its scope cover this product line, does the test report model match the quoted model. For lithium products also examine cell sourcing and datasheets.
- Licence address matches site or video
- Certificate valid and scope covers this line
- Test-report model matches the quoted model
04Capacity and equipment verification
Capacity is not a single number but whether your order can be scheduled within the given lead time. Check the equipment list and how much of the key process is in-house (own lines vs outsourced relabelling), the count and models of key equipment, actual shifts and work-in-progress, and the current load; ask for recent schedules or shipment records as corroboration. For categories involving cell matching, such as lithium and drones, also confirm whether sorting and matching equipment and ageing / charge-discharge test equipment are in-house — this directly determines mass-production consistency and is where a relabelling factory is most likely to be exposed.
- Key process in-house vs outsourced relabelling
- Sorting / matching and ageing test equipment in-house
- Current load and achievable lead time
05Quality and consistency: IQC / IPQC / OQC
Quality must land in three stages: incoming inspection (IQC, especially the acceptance criteria and non-conformance handling for cells, BMS and structural parts), in-process inspection (IPQC, patrol and records at key steps such as welding, spot-welding, assembly and potting), and outgoing inspection (OQC, sampling ratio, ageing and full-test items). Request recent sample inspection records and the non-conforming-material process, and confirm batch traceability — whether a finished batch can be traced back to cell batches and test data. Whether records are continuous and signed and dated tells you more about real management than the certificate itself.
- IQC acceptance criteria and non-conformance handling
- IPQC patrol records at key steps
- OQC sampling ratio and batch traceability
06Battery and drone-specific checks
For lithium products verify: cell sourcing and whether it is an authorised channel, the sorting and matching standard (capacity / internal-resistance / voltage binning accuracy) and consistency data, BMS protection parameters and balancing strategy, and test data (cycle, rate, low temperature, and safety items such as nail penetration and overcharge). For complete industrial drones verify: the sourcing and self-development share of the flight controller and key parts (motors, radar, blades), complete-aircraft test and flight records, and the substitutability of critical parts (to avoid a single point of supply failure). These determine post-production reliability and after-sales cost — sample specs alone are not enough.
- Cell sourcing and sorting / matching accuracy
- BMS protection parameters and balancing strategy
- Flight-controller and key-part sourcing, substitutability
07Front-load compliance and export readiness
Use the audit to bring compliance forward: for an EU target, confirm the factory’s understanding of and documentation for the EU Battery Regulation (including battery passport and carbon-footprint requirements); for complete-drone exports, confirm the target market’s aircraft access and certification requirements; shipping lithium batteries is a dangerous-goods exercise, so confirm the factory can supply a UN38.3 test summary, MSDS and compliant packaging. State the target country and use case in the RFQ so the platform can flag the relevant compliance points — assessing landed cost during comparison instead of discovering missing documents once goods are ready.
- EU Battery Regulation documentation readiness
- Target-market aircraft access and certification
- UN38.3 / MSDS / dangerous-goods packaging
08Remote audit checklist (when on-site is impossible)
When on-site is impossible, substitute a structured remote audit: pre-set the video route (raw-material store → cell store → production line → ageing and test area → finished-goods store → QC lab), require real-time, unedited footage with close-ups at key workstations; spot-check original documents (licence, certificates, recent inspection records) for validity and model; witness one key test remotely (e.g. charge-discharge or leak test); and request extra documents or third-party reports for doubtful items. Write the conclusion into a formal record and file it in the supplier profile as the basis for re-audits and comparison, instead of asking the same questions again each time.
- Preset route, real-time and unedited
- Spot-check original documents for validity and model
- Witness one key test remotely