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LiFePO4 Battery Incoming Inspection Guide: How Importers Verify Shipments from China
Your batteries have arrived from China. Now what? This guide gives importers, distributors, and wholesalers a practical incoming inspection workflow: what to check, in what order, with what tools — and what to do when something fails. Methods and reference thresholds are included; final acceptance criteria belong in your purchase contract.
Before the Shipment Arrives: Preparation
Prepare your inspection area, tools (multimeter, clamp meter, IR tester, capacity tester), and documentation templates before the truck arrives. Photograph the sealed container/pallets on arrival.
Step 1: Documentation Check
Verify packing list, commercial invoice, UN38.3 test summary, MSDS, and any agreed certificates match the shipment. Record batch/serial numbers.
Step 2: Visual Inspection
Check every unit: enclosure finish, terminals, labels, warning markings. Photograph any shipping damage immediately — this is your evidence chain.
Step 3: Weight Verification (Anti-Fraud)
Weigh each unit. A real 100Ah LiFePO4 battery weighs ~12-14kg; a “100Ah” unit at 8kg is physically impossible and indicates fraud. Compare against the supplier’s spec sheet. Document deviations.
Step 4: Voltage Screening
Measure open-circuit voltage of every unit with a calibrated multimeter. For 12V LiFePO4 at rest: expect 13.2-13.4V. Flag units deviating >0.3V from the batch mean. For multi-unit shipments, check cell-to-cell consistency.
Step 5: Internal Resistance Testing
Use an AC internal resistance tester (1kHz). Reference threshold: for EVE LF280-class cells, ≤0.25mΩ at 30% SOC is a typical manufacturer spec. Within a matched batch, IR spread should be ≤0.05mΩ. These are reference values — confirm against your cell manufacturer’s datasheet.
Step 6: Capacity Spot Testing
Select 2-5 units per batch for full charge-discharge testing: 0.2C constant current discharge to 2.5V/cell. Compare measured capacity to rated. Allow 5% tolerance as a common commercial reference (not an industry standard).
Step 7: BMS Function Verification (Safe Methods Only)
Verify BMS protection engages during normal charge/discharge: over-charge cutoff, over-discharge cutoff, and temperature protection. Never perform destructive tests (short circuit, overcharge beyond spec) — these are dangerous and void warranties. Check Bluetooth/app monitoring if equipped.
Step 8: Sampling Plans
For large shipments, formal sampling per ANSI/ASQ Z1.4 is standard practice. Visual + weight on 100%, voltage on 100% or large sample, capacity on small sample (2-5 units). AQL limits are negotiated in your contract.
Step 9: Documentation & Record Keeping
Photograph everything: batch numbers alongside test readings, failed units with close-ups. Keep records for at least 3 years. This documentation is your basis for any claim.
Step 10: Non-Conforming Product & Claims
1) Quarantine failed units. 2) Document with photos + test data. 3) Notify supplier in writing with evidence. 4) Reference contract acceptance criteria. 5) Negotiate: replacement, credit, or return.
Tools You Need
- Digital multimeter (calibrated)
- Clamp meter for current
- AC internal resistance tester (1kHz)
- Capacity tester / electronic load
- Camera for documentation
Safety Notes
- Never short-circuit batteries for testing
- Never overcharge beyond manufacturer spec
- Test in ventilated area, away from flammables
- Wear eye protection when handling terminals
FAQ
How many should I test — full or sampling?
Visual + weight on 100%, voltage on 100% or large sample, capacity on 2-5 units per batch. Formal plans reference ANSI/ASQ Z1.4.
What voltage spread indicates a problem?
>0.3V deviation from batch mean warrants investigation. Check against manufacturer spec.
What if capacity is 5% below rated?
5% is a common commercial tolerance reference, not a standard. Refer to your contract.
Can I test BMS short-circuit protection?
No — never perform destructive tests. Verify normal cutoff functions only.
Related Guides
See also: Supplier Verification Guide (before ordering), Grade A vs B Cells, BMS Selection Guide.
Contact LJY Energy for inspection support on your orders.
Note: Reference thresholds are manufacturer specs or community references, not industry standards. Acceptance criteria per your purchase contract. Parameter examples as of Oct 2026.
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