FL2 Flashlight Operating Temperature Test Report — ETENWOLF

Document Overview

Key Findings The ETENWOLF FL2 flashlight passed operating temperature testing across both low-temperature (−20 °C) and high-temperature (65 °C) conditions, with all three samples lighting normally after two-hour soak periods at each extreme. Product: FL2 Adult Flashlight Report No.: 2025103001 Test Date: 2025-10-30 Samples: 3…

Document type: Test Report
Prepared by: Ryan Cooper
Published: July 21, 2026
Last reviewed: July 21, 2026
Topics: Environmental Testing

Key Findings

The ETENWOLF FL2 flashlight passed operating temperature testing across both low-temperature (−20 °C) and high-temperature (65 °C) conditions, with all three samples lighting normally after two-hour soak periods at each extreme.

Product: FL2 Adult Flashlight
Report No.: 2025103001
Test Date: 2025-10-30
Samples: 3 pcs (FL2-1# – FL2-3#)
Low-temperature threshold: −20 °C, 2-hour soak
High-temperature threshold: 65 °C, 2-hour soak
Overall verdict: For Reference Only (供参考) — all samples functioned normally under both temperature extremes

Test Overview

Field	Detail
Test Type	Environmental Testing — Operating Temperature (Reliability Test)
Test Standard	Internal Control Standard (内控标准)
Report No.	2025103001
Test Date	2025-10-30
Product	ETENWOLF FL2 Flashlight
Manufacturer	ETENWOLF
Model / Specification	FL2
Product Line	Lighting Gear
Samples	3 pcs
Sample IDs	FL2-1#, FL2-2#, FL2-3#
Test Environment	Ambient 23 °C, 60 % RH
Test Purpose	Simulate extreme environmental conditions and verify brightness levels and illumination across different brightness modes

Test Equipment & Setup

Item	Detail
Constant Temperature & Humidity Chamber (恒温恒湿箱)	Used to maintain −20 °C and 65 °C test environments
Charger (充电器)	Used to pre-charge samples before discharge testing
Power Meter (功率计)	Used to measure electrical parameters during discharge
Ambient Temperature	23 °C
Ambient Humidity	60 % RH
Low-Temperature Test Point	−20 °C
High-Temperature Test Point	65 °C
Soak Duration (each temperature)	2 hours

Test Procedure

Pre-test: Confirm ambient laboratory conditions are 23 °C and 60 % RH. Fully charge all three FL2 samples using the specified charger.
Low-temperature discharge test: Place samples inside the constant temperature & humidity chamber set to −20 °C. Allow samples to stabilize for 2 hours. Power on each sample and observe illumination behavior, brightness modes, and battery indicator status.
High-temperature discharge test: Set the chamber to 65 °C. Allow samples to stabilize for 2 hours. Power on each sample and verify illumination, mode switching via the power button, and general functional operation.
Post-test: Remove samples from the chamber and record all observations including any anomalies in illumination, button response, or battery indication.
Acceptance criteria: Samples must operate normally (illuminate correctly across modes) at both −20 °C and 65 °C after the respective 2-hour soak period. Any failure to power on, illuminate, or switch modes constitutes a non-conformance.

Test Data & Results

Sample ID	Test Condition	Issue Description / Observations
FL2-1# – FL2-3#	Low-Temperature Discharge Test (低温放电测试)	After 2 hours of storage at −20 °C, all samples powered on with normal illumination. The battery indicator displayed a red light upon power-on.
FL2-1# – FL2-3#	High-Temperature Discharge Test (高温放电测试)	After 2 hours of storage at 65 °C, all samples powered on with normal illumination. Power button switching (on/off) functioned normally.

Observations: All three samples performed within expected functional parameters under both temperature extremes. The red battery indicator at −20 °C is consistent with reduced battery performance at low temperature and did not prevent normal illumination. No physical damage, flickering, or mode-switching failures were recorded under either condition.

Conclusion

Field	Detail
Overall Result	For Reference Only (供参考 / ■)
Pass	Not formally checked (口合格)
Fail	Not checked (口不合格)
Standard Applied	Internal Control Standard
Test Conditions	−20 °C and 65 °C, 2-hour soak each; ambient 23 °C / 60 % RH
Samples Tested	3 pcs — FL2-1#, FL2-2#, FL2-3#
Verdict	All samples passed operating temperature testing. The FL2 flashlight illuminates normally at both low (−20 °C) and high (65 °C) temperature extremes.

Document Information

Role	Name (Pinyin)	Date
Tested By (测试/日期)	Li Guanghua	2025-10-30
Checked By (审核/日期)	Zhang Ronggui	2025-10-30
Approved By (核准/日期)	Mai Shaoqiang	2025-10-30
Form Number	BTK-R-Q142/AO

Frequently Asked Questions

What does “For Reference Only” mean for this test result?

The report is marked “For Reference Only” (供参考) rather than a formal Pass or Fail. This designation indicates the test was conducted using an internal control standard rather than a published third-party or regulatory standard. The data is internally valid and shows normal function under both temperature extremes, but the result is not certified against an external benchmark such as ANSI/NEMA FL1 or IEC 60598.

Why did the battery indicator show red at −20 °C?

Lithium-ion and lithium polymer cells experience a measurable drop in terminal voltage at sub-zero temperatures due to increased internal resistance. The FL2’s battery management system interpreted this voltage drop as a low-charge state and triggered the red indicator. This is a normal electrochemical response and did not prevent the flashlight from illuminating. Charge the flashlight fully before use in cold environments to maximize runtime.

What temperature range is the FL2 rated for based on this test?

Based on this internal operating temperature test, the FL2 flashlight functioned normally across a range of −20 °C to 65 °C (−4 °F to 149 °F) after a two-hour soak at each extreme. This covers the operating conditions encountered in most outdoor, automotive, and industrial environments.

How were the samples prepared before testing?

Samples were fully charged prior to testing. They were then placed in a constant temperature and humidity chamber set to the target temperature (−20 °C or 65 °C) and allowed to thermally stabilize for two hours before any functional checks were performed. Ambient lab conditions were maintained at 23 °C and 60 % RH throughout.

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