Document Overview
Key Findings The ETENWOLF FL2 flashlight completed a 72-hour thermal shock cycle (−20 °C to 60 °C / 80 % RH) with no functional failures — illumination output, switch response, and charging performance all remained normal throughout. Product: ETENWOLF FL2 Flashlight Test Type: Thermal Shock…
- Document type
- Test Report
- Prepared by
- Ryan Cooper
- Published
- Last reviewed
- Topics
- Environmental Testing
Key Findings
The ETENWOLF FL2 flashlight completed a 72-hour thermal shock cycle (−20 °C to 60 °C / 80 % RH) with no functional failures — illumination output, switch response, and charging performance all remained normal throughout.
- Product: ETENWOLF FL2 Flashlight
- Test Type: Thermal Shock / Temperature Cycling (Cold & Hot Shock)
- High-Temperature Phase: 60 °C, 80 % RH, 2 hours per cycle
- Low-Temperature Phase: −20 °C, 2 hours per cycle
- Total Storage Duration: 72 hours
- Samples Tested: 3 pcs
- Verdict: Pass ✓
Test Overview
| Field | Details |
|---|---|
| Test Type | Thermal Shock / Cold-Hot Shock Test (冷热冲击测试) |
| Report Number | 2025110601 |
| Test Dates | 2025-11-03 to 2025-11-06 |
| Product Name | ETENWOLF FL2 Flashlight |
| Manufacturer | BTK |
| Surface Treatment | / (Not applicable) |
| Sample Quantity | 3 pcs |
| Test Reason | New Product Qualification |
| Test Purpose | Evaluate the durability of the sample when stored in extreme temperature environments |
| Laboratory Environment | Temperature: 24 °C; Humidity: 45 % RH |
| Page | 1 |
Test Equipment & Setup
| Parameter | Details |
|---|---|
| Instrument | Constant Temperature and Humidity Testing Machine (恒温恒湿试验机) |
| High-Temperature Condition | 60 °C, Humidity 80 % RH, Duration: 2 hours |
| Low-Temperature Condition | −20 °C, Duration: 2 hours |
| Total Storage Duration | 72 hours |
| Post-Storage Test | Functional test (lighting, switch, charging) |
| Test Class / Level | — (not specified) |
| Acceptance Requirement | Sample illumination brightness normal; performance stable |
Test Procedure
- Pre-Test Preparation: Record baseline condition of 3 FL2 flashlight samples. Verify laboratory environment at 24 °C / 45 % RH. Set chamber program control profile for alternating high/low temperature cycles.
- High-Temperature Phase: Place samples in constant temperature and humidity chamber. Set chamber to 60 °C with 80 % RH. Hold for 2 hours.
- Low-Temperature Phase: Transition chamber to −20 °C (humidity uncontrolled). Hold for 2 hours.
- Repeat Cycling: Continue alternating high/low temperature phases per the program control profile for a cumulative total storage duration of 72 hours.
- Post-Test Functional Inspection: Remove samples from chamber after 72 hours total storage. Allow samples to return to ambient conditions. Inspect appearance for abnormalities. Operate switch button and verify contact sensitivity. Activate illumination and verify normal lighting output. Inspect lens/lamp cover for embrittlement or cracking. Verify charging function operates normally.
- Acceptance Criteria: Sample illumination brightness must be normal; overall performance must be stable. No appearance defects, no functional failures.
Test Data & Results
| Inspection Item | Observation / Result |
|---|---|
| Post-storage illumination | Normal — lighting output unchanged after 72 h extreme-environment storage |
| Lamp cover / lens condition | No embrittlement; no cracks detected (灯罩无脆化无裂纹) |
| Charging function | Normal — charging operates correctly after storage |
| Overall appearance | No abnormalities observed on exterior |
| Switch button contact | Sensitive and responsive — no degradation |
| Functional status | No functional failures recorded across all 3 samples |
Summary: After 72 hours of extreme-environment storage (alternating −20 °C and 60 °C / 80 % RH), all 3 FL2 flashlight samples passed visual and functional inspection. Appearance showed no abnormalities, switch button contact remained sensitive, illumination output was normal, and no failures were observed.
Conclusion
| Item | Details |
|---|---|
| Test Standard / Condition | High temp: 60 °C / 80 % RH / 2 h per cycle; Low temp: −20 °C / 2 h per cycle; Total: 72 h storage |
| Samples Tested | 3 pcs — ETENWOLF FL2 Flashlight |
| Result | ■ Pass □ Fail □ Reference |
| Verdict | PASS — All samples meet the requirement that illumination brightness is normal and performance is stable after extreme-temperature storage. |
Document Information
| Role | Name (Pinyin) |
|---|---|
| Approval (核准) | Mai Shaoqiang |
| Review (审查) | Zhang Ronggui |
| Tester (试验人) | Li Guanghua |
| Form Number | BTK-R-Q-087A/1 |
Frequently Asked Questions
What temperature range was the ETENWOLF FL2 flashlight tested to?
The FL2 flashlight was subjected to thermal shock cycling between −20 °C (low temperature) and 60 °C at 80 % relative humidity (high temperature), with each phase held for 2 hours. Total storage duration across all cycles was 72 hours.
Did the FL2 flashlight pass the thermal shock test?
Yes. All 3 samples passed. After 72 hours of extreme-temperature storage, the FL2 showed no appearance abnormalities, no lens embrittlement or cracking, normal illumination output, responsive switch contact, and normal charging function.
What equipment was used to conduct the FL2 temperature cycling test?
The test was performed using a Constant Temperature and Humidity Testing Machine (恒温恒湿试验机) at BTK’s laboratory. The ambient laboratory environment was maintained at 24 °C and 45 % RH during pre- and post-test evaluation.
Why is thermal shock testing important for flashlights?
Flashlights are frequently stored and used across extreme environments — from freezing outdoor conditions to hot vehicles or direct sunlight. Thermal shock testing verifies that the housing materials, lens, electronics, and battery contacts remain structurally sound and fully functional after repeated exposure to rapid temperature extremes, ensuring reliable performance when it matters most.