Inspection requirements and operation methods for mobile power banks, as well as factory inspection and verification services

2025年9月12日

Nowadays, as the battery capacity of smartphones gradually increases, mobile power banks remain one of the essential accessories for many people in their daily lives and when traveling. Especially when going on a trip, a reliable and adequate capacity mobile power bank can greatly alleviate the anxiety about power supply. Therefore, conducting professional and systematic inspection of mobile power banks during the production and delivery processes is particularly important. Inspectors need to strictly follow the customer requirements and industry standards, and comprehensively evaluate the product quality from multiple aspects. Here is a complete set of mobile power bank inspection methods, covering factory inspection, inspection process, test items, and common defect determination, which is suitable for reference by quality control and purchasing managers.
I. Overview of the Inspection Process
Carry out the necessary preparations before the inspection as required by the company and the customers.
Conduct sampling inspection in accordance with the AQL sampling standard
Carry out comprehensive inspection projects, special tests and confirmatory inspections
Confirm the inspection results together with the factory's quality supervisor
Prepare and submit a detailed inspection report
II. Preparations Before Testing
Verify and test the equipment (multimeter, stabilized power supply, barcode scanner, load meter, etc.), ensuring that it is within the valid calibration period and functioning properly.
Confirm that the test samples provided by the factory are consistent with the actual delivered product models, and clearly record this in the report.
Prepare the tools for screen printing and label durability tests (such as friction testers, tapes, etc.)
Be familiar with product specifications, customer inspection standards, and international safety regulations (such as CE, FCC, RoHS, etc.)
III. Detailed Explanation of On-site Inspection Items
Full inspection items (appearance and basic functions):
The outer box should be clean and undamaged, and the color box or vacuum-formed packaging should be intact.
Test of charging current for mobile power supply: Use a stabilized power supply to set the voltage range (such as 5.0 - 5.3Vdc), and check if the charging current exceeds the limit.
No-load output voltage: Should fall within the specified range (e.g. 4.75 - 5.25 Vdc)
Loaded output voltage: Measure whether the output meets the standard under the specified load conditions (e.g. 4.60 - 5.25 Vdc)
Data+ / Data- Voltage Check: As for Apple accessories, the voltage typically required is 1.80 - 2.10 Vdc.
Short circuit protection function: Simulate a short circuit situation to verify that the equipment can automatically cut off the output.
LED indicator light status: Consistent with the description in the manual.
Power adapter safety test (if equipped): Must comply with international electrical safety standards
Special inspection items (3 units per item):
Standby current test: Remove the device and measure the PCBA. The current should typically be less than 100 microamps.
Overcharge/overdischarge/overcurrent protection voltage: Measure the voltage at key points of the protection circuit to determine if it meets the design threshold.
Discharge time test: Perform continuous discharge at the nominal capacity and current, and calculate whether the actual discharge duration meets the standard.
Actual usage test: Connect devices such as mobile phones, record charging behaviors and times, and pay attention to the influence of device models and working conditions on the results.
Print and screen printing reliability: Conduct wear resistance and adhesion tests using specialized tools
USB cable length: Check if it meets the requirements specified in the customer's information.
Barcode scanability: Random sampling scanning to ensure clear and legible barcodes
Confirm the inspection items (take one unit for each item):
Disassemble the machine for internal structure inspection: evaluate PCB process, solder joint quality, battery fixation method, etc.
Record the PCB version number and verify its consistency with the customer's sample.
Measure the dimensions and gross weight of the outer box, for use in logistics and packaging evaluations
Carry out the outer box drop test: simulate the transportation environment and check the packaging's impact resistance capability
IV. Classification of Common Defects
Critical Defects:
The mobile power supply cannot charge, the interface is deformed or rusted, or the protection function fails.
Major Defects:
Incorrect LED battery indication,fall off of the rubber pad, poor adhesion of the nameplate, and seriously inaccurate actual capacity marking.
Minor Defects:
Appearance scratches, minor dirtiness, unclear packaging printing
V. Summary
The inspection of mobile power supplies is a systematic and meticulous task, covering multiple aspects such as appearance, performance, safety, and reliability. In addition to strictly following the inspection procedures, inspectors should also possess certain knowledge of electronic products and testing skills. At the same time, they should pay attention to communication with the factory and maintain standard consistency. It is recommended that enterprises get involved in quality management during the factory inspection stage to ensure that the production process complies with the ISO system and customer standards. By controlling product quality from the source, they can ultimately deliver safe and reliable mobile power supply products that satisfy customers.
If you are in need of professional third-party inspection services or factory auditing assistance, it is recommended that you choose a quality control team with qualifications and rich experience. Such a team can help your company effectively reduce the risk of returns, enhance supply chain compliance, and improve product competitiveness.