Document Overview
Key Findings The FL2 flashlight completed a high/low temperature storage cycle test and passed all acceptance criteria with no surface discoloration and normal power on/off operation. Test type: High and Low Temperature Cycle Storage Test Report No.: 2025050801 Test date: 2025-05-08 Temperature range: −20 °C…
- Document type
- Test Report
- Prepared by
- Ryan Cooper
- Published
- Last reviewed
- Topics
- Environmental Testing
Key Findings
The FL2 flashlight completed a high/low temperature storage cycle test and passed all acceptance criteria with no surface discoloration and normal power on/off operation.
- Test type: High and Low Temperature Cycle Storage Test
- Report No.: 2025050801
- Test date: 2025-05-08
- Temperature range: −20 °C (2 h) → 60 °C (2 h), 1 cycle total
- Samples: 3 PCS of FL2 prototype flashlight
- Manufacturer: BTK
- Electrical characteristics: OK
- Structural characteristics: OK
- Overall verdict: Pass
Test Overview
| Field | Detail |
|---|---|
| Test Type | High and Low Temperature Cycle Storage Test (高低度循环试验) |
| Standard / Test Class | / |
| Report No. | 2025050801 |
| Date | 2025-05-08 to 2025-05-08 |
| Product | FL2 Flashlight (FL2试产品) |
| Manufacturer | BTK |
| Surface Treatment | / |
| Sample Quantity | 3 PCS |
| Test Reason | Other (其它) — checked on original report |
| Test Purpose | Verify the storage reliability of the sample in high-temperature and low-temperature environments (simulating use under extreme conditions) |
| Laboratory Environment | Temperature: 22 °C; Humidity: 55 % RH |
Test Equipment & Setup
| Item | Detail |
|---|---|
| Instrument Name | Constant Temperature & Humidity Testing Machine (恒温恒湿试验机) |
| Low Temperature Stage | −20 °C / 2 hours |
| High Temperature Stage | 60 °C / 2 hours |
| Number of Cycles | 1 cycle total |
| Laboratory Temperature | 22 °C |
| Laboratory Humidity | 55 % RH |
Test Procedure
- Pre-test: Record baseline electrical and structural characteristics of all 3 FL2 samples. Photograph samples before placement in the chamber (sample placement photo captured — 测试前 样品放置图).
- Chamber loading: Place samples inside the constant temperature & humidity testing machine and configure the program control profile.
- Low-temperature stage: Set chamber to −20 °C and hold for 2 hours (program control chart 1 — 程序控制图1 recorded).
- High-temperature stage: Ramp chamber to 60 °C and hold for 2 hours (program control chart 2 — 程序控制图2 recorded).
- Post-test (after −20 °C stage): Photograph and inspect samples for surface discoloration and verify power on/off operation.
- Post-test (after 60 °C stage): Photograph and inspect samples for surface discoloration and verify power on/off operation.
- Acceptance criteria: No surface discoloration after testing; power on/off operation functions normally.
Test Data & Results
| Result Category | Item | Result |
|---|---|---|
| Test Results (试验结果) | Electrical Characteristics (电气特性) | OK |
| Test Results (试验结果) | Structural Characteristics (structural feature / 结构特性) | OK |
Photo Documentation
| Photo Reference | Description |
|---|---|
| 测试前 — Pre-test | Sample placement photo before testing |
| 程序控制图1 — Program Control Chart 1 | Chamber program profile captured at start of test |
| −20 °C 测试后 — Post −20 °C test | Sample inspection photo after low-temperature stage |
| 程序控制图2 — Program Control Chart 2 | Chamber program profile captured mid-cycle |
| 60 °C 测试后 — Post 60 °C test | Sample inspection photo after high-temperature stage |
Observations (备注): After testing, no discoloration appeared on the sample surfaces, and power on/off operation was normal.
Conclusion
| Field | Detail |
|---|---|
| Result | Pass (合格) |
| Standard / Test Class | / |
| Test Conditions | −20 °C / 2 h → 60 °C / 2 h, 1 cycle; Lab: 22 °C, 55 % RH |
| Samples Tested | 3 PCS FL2 prototype flashlight |
| Electrical Characteristics | OK |
| Structural Characteristics | OK |
| Verdict | ■ Pass — No surface discoloration; power on/off operation normal after full temperature cycle |
Document Information
| Role | Name |
|---|---|
| Approval (核准) | — |
| Review (审查) | — |
| Tester (试验人) | Su Yimei (粟仪梅) |
| Form Number (表单编号) | BTK-R-Q-087A/1 |
| Page | 1 |
| Report No. | 2025050801 |
| Date | 2025-05-08 to 2025-05-08 |
Frequently Asked Questions
What does the high and low temperature storage test verify for the FL2 flashlight?
The test verifies that the FL2 flashlight can be stored and remain functional after exposure to extreme temperatures. By cycling the product through −20 °C and 60 °C conditions, the test simulates real-world cold storage (winter environments, cold chain logistics) and heat exposure (vehicle interiors, tropical climates) to confirm no physical or electrical degradation occurs.
Why is a −20 °C to 60 °C range used for this test?
This range represents practical storage extremes for consumer lighting products. −20 °C covers cold-region winter storage, while 60 °C reflects temperatures that can be reached inside parked vehicles or outdoor storage in hot climates. Together they stress both the plastic housing and the internal electronics to catch potential failure modes like brittleness, warping, or contact degradation.
What acceptance criteria must the FL2 meet to pass this test?
Two criteria apply: (1) no surface discoloration on any of the three samples after the full temperature cycle, and (2) normal power on/off operation after testing. Both criteria were met, and the report records a Pass judgment.
How many cycles were performed and how long did the test take?
One complete cycle was performed. Each stage held temperature for 2 hours — 2 hours at −20 °C followed by 2 hours at 60 °C — for a minimum active test duration of 4 hours, plus any ramp/transition time managed by the constant temperature and humidity testing machine program.
Related Products
Learn more about the FL2 flashlight and explore related ETENWOLF lighting gear:
- ETENWOLF FL2 Flashlight — Product Page
- More articles by Ryan Cooper