Document Overview
Key Findings The ETENWOLF HB2 hair dryer passed charging tests at 0°C and 45°C and discharge tests at 70°C; one of three samples triggered low-temperature battery protection at −20°C and could not power on, but recovered normally at room temperature — the overall result is…
- Document type
- Test Report
- Prepared by
- Alex Newman
- Published
- Last reviewed
- Topics
- Environmental Testing
Key Findings
The ETENWOLF HB2 hair dryer passed charging tests at 0°C and 45°C and discharge tests at 70°C; one of three samples triggered low-temperature battery protection at −20°C and could not power on, but recovered normally at room temperature — the overall result is For Reference Only.
- Product: ETENWOLF HB2 Hair Dryer
- Report No.: 2025042201
- Test Dates: 2025-04-21 to 2025-04-22
- Samples: 3 pcs (4#–6#)
- Standard: Internal Control Standard
- Test Type: Reliability Test
- Verdict: For Reference Only (■供参考)
- Critical Finding: 1/3 samples unable to power on at −20°C due to low-temperature battery protection; recovered after returning to room temperature
Test Overview
| Field | Detail |
|---|---|
| Product No. / Name | HB2 Hair Dryer (吹风机) |
| Model / Type Specification | HB2 |
| Report No. | 2025042201 |
| Test Date | 2025-04-21 to 2025-04-22 |
| Sample Quantity / No. | 3 PCS (4#–6#) |
| Test Type | Reliability Test (■可靠性测试) |
| Test Standard | Internal Control Standard (内控标准) |
| Test Purpose | Evaluate the effect of operating temperature on sample performance under high and low temperature storage conditions |
| Acceptance Criterion | Samples operate normally at the specified ambient temperatures |
| Manufacturer / Brand | ETENWOLF |
Test Equipment & Setup
| Item | Detail |
|---|---|
| Test Equipment | Constant Temperature and Humidity Chamber (恒温恒湿箱) |
| Room Temperature | 23°C |
| Room Humidity | 60% |
| Low-Temperature Charge Condition | 0°C, 2 hours storage |
| Mid-Temperature Charge Condition | 45°C, 2 hours storage |
| High-Temperature Discharge Condition | 70°C, 2 hours storage |
| Low-Temperature Discharge Condition | −20°C, 2 hours storage |
Test Procedure
- Pre-test: Confirm samples (4#–6#) are in normal operating condition at room temperature (23°C, 60% RH).
- Low-temperature charge test: Place samples in chamber set to 0°C; hold for 2 hours; power on and verify normal startup, charging, battery display, and key functions.
- Mid-temperature charge test: Place samples in chamber set to 45°C; hold for 2 hours; power on and verify normal startup, charging, battery display, and key functions.
- High-temperature discharge test: Place samples in chamber set to 70°C; hold for 2 hours; power on and verify normal startup, operation, battery display, and key functions.
- Low-temperature discharge test: Place samples in chamber set to −20°C; hold for 2 hours; attempt to power on and verify normal startup, operation, battery display, and key functions.
- Post-test recovery: Return any samples that failed to power on to room temperature and recheck operability.
- Acceptance check: Samples must operate normally at all specified temperatures. Document any anomalies with observations.
Test Data & Results
| Sample ID | Test Condition | Observations |
|---|---|---|
| 4#–6# | Low-Temperature Charge Test (0°C) | After 2 hours storage at 0°C, all samples powered on normally, charging initiated normally, battery level display normal, all button functions normal. |
| 4#–6# | Mid-Temperature Charge Test (45°C) | After 2 hours storage at 45°C, all samples powered on normally, charging initiated normally, battery level display normal, all button functions normal. |
| 4#–6# | High-Temperature Discharge Test (70°C) | After 2 hours at 70°C, all samples powered on and ran normally, battery level display normal, all button functions normal. |
| 4#–6# | Low-Temperature Discharge Test (−20°C) | After 2 hours at −20°C: 2 pcs powered on and ran normally; 1 pc triggered low-temperature battery protection and could not power on. After returning to room temperature, the sample recovered and powered on normally. |
Summary: All 3 samples charged normally at 0°C and 45°C and discharged normally at 70°C. At −20°C, 1 of 3 samples was protected by the low-temperature battery protection circuit and could not power on; it recovered fully upon returning to room temperature. The result is recorded as For Reference Only.
Conclusion
| Field | Detail |
|---|---|
| Pass | □ Pass (口合格) |
| Fail | □ Fail (口不合格) |
| Verdict | ■ For Reference Only (供参考) |
| Standard / Criterion | Internal Control Standard — samples must operate normally at specified temperatures |
| Test Temperatures | 0°C (charge), 45°C (charge), 70°C (discharge), −20°C (discharge) |
| Samples Tested | 3 PCS (4#–6#) |
| Key Finding | 1/3 samples could not power on at −20°C due to low-temperature battery protection; recovered at room temperature. All other conditions passed. |
Document Information
| Role | Name (Pinyin) | Date |
|---|---|---|
| Tested By (测试/日期) | Li Guanghua | 2025-04-22 |
| Checked By (审核/日期) | Zhang Ronggui | 2025-04-22 |
| Approved By (核准/日期) | Mai Shaoqiang | 2025-04-22 |
| Form No. | BTK-R-Q142/AO | — |
Frequently Asked Questions
What temperatures was the ETENWOLF HB2 hair dryer tested at?
The HB2 was tested at four operating temperatures: 0°C (low-temperature charge), 45°C (mid-temperature charge), 70°C (high-temperature discharge), and −20°C (low-temperature discharge), with samples held at each temperature for 2 hours before evaluation.
Did the ETENWOLF HB2 pass the −20°C low-temperature discharge test?
Not fully. At −20°C, 2 out of 3 samples powered on and operated normally. The third sample triggered its low-temperature battery protection circuit and could not power on. After returning to room temperature, that sample recovered and powered on normally. The overall result is therefore recorded as For Reference Only rather than a full Pass.
What does ‘For Reference Only’ mean in the ETENWOLF HB2 test report?
‘For Reference Only’ (供参考) means the test results are documented for engineering or design reference but do not constitute a formal Pass or Fail verdict. In this case it reflects the anomalous −20°C finding, which is within expected behavior for lithium battery low-temperature protection but is noted for product development consideration.
What equipment was used for the HB2 operating temperature test?
A constant temperature and humidity chamber (恒温恒湿箱) was used to condition samples at the target temperatures. The ambient lab conditions during the test were 23°C and 60% relative humidity.
Related Products
- ETENWOLF Official Website — explore the full range of ETENWOLF inflation and air tools
- HB2 Hair Dryer — Operating Temperature Test (this report, sheet: 工作温度测试)