Factory Acceptance Test Checklist for Custom Battery PACK

Why FAT is a payment gate—not a factory tour

Factory Acceptance Test for custom lithium battery PACK is where OEM promises meet buyer meters. Before any shipment milestone releases, FAT should prove drawing revision, cell lot traceability, BMS firmware hash, and measured capacity against the purchase order—not a polished demo on cherry-picked samples. Procurement teams that treat FAT as hospitality spend pay twice: once at the line and again when field swaps expose threshold drift.

Electrical, protection, and communication depth

Validate over-charge, over-discharge, over-current, and short-circuit behavior with calibrated loads—not handheld guesses. Read RS485 or CAN registers for voltage, current, SOC, temperature, and alarm codes under scripted scenarios. Shenzhen Tuorde Energy QA teams photograph connector polarity, torque marks, and serial labels into the FAT archive so disputes after ocean freight still have traceable evidence.

Agreeing sample size and pass criteria upfront

One hundred percent electrical test is rare at volume; AQL sampling is common—but the sample plan must be written before production starts. Define rework limits, retest rules, and who signs a conditional release. Separate cosmetic criteria from safety-critical thresholds so a scratched enclosure never masks a wrong BMS firmware.

Packing, documents, and release discipline

Confirm UN38.3 summary numbers on cartons match the PO model, MSDS revision dates align with the importer file, and spare connectors match the packing list. Reject lots when firmware differs from the signed golden unit without a formal change notice. FAT completion should include a signed trace matrix linking cell lot, BMS hash, and pack serial range.

What fails silently after weak FAT

Weak FAT exports threshold drift, wrong shunt calibration, and protocol endian errors that only appear under site EMS polling. The cost shows up as truck rolls and airport overtime—not as a line-stop at the factory.

Tuorde Energy FAT support for OEM PACK buyers

Shenzhen Tuorde Energy (拓尔德能源) hosts buyer-side FAT for B2B LiFePO4 PACK programs with shared test scripts, register maps, and photo archives aligned to export documentation. Importers can align FAT timing with UN38.3 and MSDS bundles before booking freight.

If FAT cannot survive an audit six months later, it was theater—not acceptance.

Buyer verification checklist

Lock drawing revision, cell lot, and BMS firmware hash before sampling starts.

Script protection tests with calibrated loads and logged register reads.

Write AQL sample size and conditional release rules in the PO annex.

Match carton UN38.3 and MSDS versions to the commercial invoice model.

Archive polarity photos and serial ranges with the signed FAT report.

FAQ for procurement teams

Who should attend FAT in person?

Ideally the buyer’s electrical engineer and a logistics contact who owns export files. Remote video FAT works when meters, load banks, and register screens are readable and recordings are stored with the quality system—not in a chat thread.

Practical next step

Send your PO protection limits and protocol map to Tuorde Energy to receive a buyer-side FAT script and release checklist tailored to your OEM PACK program. product catalog · manufacturing capability · buyer support · request a quote.