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Batteroo testing
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FrankBuss:
Might be easier than I thought. On the package is a small "*" after the text "up to 18 hours burn time", which says "average hours of burning until residual flux amounts to 1 lumen". Maybe I should use the specified operating time to determine if it is dead, because this is how the product is specified, no subjective arguments. This means: measure lux at start (which is at 16 lumen output as specified), then measure the time until it is 1/16 of this intensity.

Drawback of this method is that this would be really the worst case for Batteroo, because when the battery is at maybe 0.5 V, it will be only seconds if Batteroo starts at all until it is 1 lux and below again.
onlooker:
For a flashlight like this, one can measure the total accumulated light output. I think it may not be perfect, but it is more objective.

An indirect and simpler way to do this is a relative and comparative measurement using a lux meter. The lux meter is better to have a serial interface. One can set the lux meter at a fixed distance from the flashlight and record the lux value vs time. The number to compare (with and w/o the sleeve) is the integration of lux over time.
Luminax:
Do you by any chance happen to prepare ordinary (bulb) flashlight as well?

Might be a good benchmark testing a resistive type flashlight which is just that, a pair of wire across the battery(ies).

As for lux meter... wonder if it's reliable to get a photodiode and whack it on an arduino or something... hmmmmmmmm......
ez24:

--- Quote from: FrankBuss on December 19, 2016, 10:38:47 pm ---Drawback of this method is that this would be really the worst case for Batteroo, because when the battery is at maybe 0.5 V, it will be only seconds if Batteroo starts at all until it is 1 lux and below again.

--- End quote ---
If I am not mistaking, Batteroo said not to use their devices in LED flashlights.  (it is in their instructions)
FrankBuss:
While waiting for the Batteroo sleeves, I did the MP3 player test again, this time with "Duracell plus power" (only genuine with the Duracell bunny  :) ). Here is the logging. The MP3 player turned off after 14:30 hours, compared to 13:35 hours with the Energizer alkaline power batteries, so not much difference.
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