Astrolux FT03 XHP50.2 Flashlight - Best Value 2019 - How To Choose The Right Battery

LED Flashlights – General Info 26650 Flashlights
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Recommend using battery: Samsung INR21700-40T

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I think your multimeter is affecting the readings.

You should use something like a 10mOhm shunt to simulate real current draw.

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Thank you so much my friend