| Electronics > Projects, Designs, and Technical Stuff |
| Batteroo testing |
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| FrankBuss:
--- Quote from: EEVblog on December 18, 2016, 09:38:35 am ---Yes, I encourage everyone to follow that procedure for product testing (no test gear needed) and send me the results to dave@eevblog.com and I'll add them to the spreadsheet. --- End quote --- How do I determine when the product dies for a flashlight, without internal boost converter, and it just gets dimmer and dimmer? I don't have a flashlight with AAA cells (only a heavy old Maglite with 3 type D batteries and an incandescent bulb), but ordered one from eBay (5 EUR shipped and from Germany, batteries included, they don't make much money with this), for 2 AAA batteries, to test both Batteroo sleeves. I have this lux meter. I think a valid procedure would be to wait until I think it is too dim to be useful anymore, then measure the light intensity (might be tricky, have to shield it from other light) and then do the other tests, where the time the product died can be verified with the lux meter. But maybe the modern flashlight has a boost converter, then it will die fast and this is no problem. |
| Fungus:
--- Quote from: FrankBuss on December 19, 2016, 07:03:42 am ---maybe the modern flashlight has a boost converter, then it will die fast and this is no problem. --- End quote --- 2xAA is only about 2.5V in reality which isn't enough for a white LED. So...yes, it has a boost convertor. The lux meter will be needed to make sure it outputs the same amount of light with/without batteroo. In Waynes famous test I think his flashlights weren't running the same brightness at the start of the test. (or maybe he was just lying about the lifetimes) |
| FrankBuss:
--- Quote from: Fungus on December 19, 2016, 07:10:17 am ---The lux meter will be needed to make sure it outputs the same amount of light with/without batteroo. In Waynes famous test I think his flashlights weren't running the same brightness at the start of the test. --- End quote --- Good point, will test this. Meanwhile the first step is done, the MP3 player turned off.This is the full logging. As you can see, without Batteroo it ran 13:35 hours, pretty long. Loudness was the same all the time, as you can see in the peak value column. Cut off voltage was 1.117 V, after this the battery regenerated a bit. High-res photos of the player with the message when I turn it on (using a different battery, I'll glued a post-it on the empty battery for the step with the Batteroo sleeve), the about dialog in the menu and screenshot how it looks like when connected to the PC with the test song: So this is the start of the test: Product descrption and model: PRO2 WMA MP3 digital music player, firmware version 1.007, 256 MB flash, bought around 2004 Contributor Name: Frank Buss Battery Brand/Model Used:Energizer Alkaline Power Batterien AAA ( https://www.energizer.eu/de/product/energizer-alkaline-power/ ) Normal battery life from fresh (No Batteriser): 815 minutes might be useful to add another column: Test procedure: Turn player on, change PlayMode to repeat track, exit menu, start playing "AC-DC - Highway to Hell", change volume to max, wait until player powers off I'll use the exact same setup and test procedure when the Batteroo arrives. The remaining two tests shouldn't need that long >:D |
| Fungus:
If it cut out at 1.1V then it's not using all the battery. There could still be 10%-20% left in there. |
| FrankBuss:
Ok, I spared no expense and bought a flashlight at the local supermarket today, for EUR 3.99 :) (battery included). It is the Ledlites E3 and needs one AAA battery. The package says 16 lumen. I illuminated my lux meter in about 10 cm distance, and the light cone was about 10 cm^2, and it showed 11,740 lux. This is reasonable, because if 1,000 lumen illuminates 1m^2, the density measured in lux is 1,000 lux for this light power, so if it is concentrated on 10 cm^2, lux is equal to 100 times the lumen output, so the magnitude is right, if I understood this and my calculations are right. A pretty nice flashlight for this price. Of course there is already a review for it on Youtube: I opened it to see what's inside, here are some pics: I guess it is some kind of joule thief construction, a coil and the transistor might be on the back. Didn't want to destroy it, will do this after the test. Then I connected the plus contact (it has some mini spring on the board, this might be a problem with the Batteroo sleeve), screwed in the tube (the tube, where the minus terminal of the battery is at the end, presses on the PCB board to close the circuit, when you turn it; I sanded it to connect a crocodile clip) and tested it with a power supply. The result is amazing, you can still see it very dim at 0.2 V (no regulation, at 1.5 V it uses about 310 mA, dropping fast with voltage) : 1.5 V: 11740 lux 1.4 V: 9970 lux 1.3 V: 8020 lux 1.2 V: 6010 lux 1.1 V: 3910 lux 1 V: 1950 lux 0.9 V: 1518 lux 0.8 V: 1166 lux 0.7 V: 859 lux 0.6 V: 630 lux 0.5 V: 380 lux 0.4 V: 250 lux 0.3 V: 129.5 lux 0.2 V: 57.2 lux At 0.1 V it turned off. The ambient light was about 38 lux. It turns on again at 0.63 V when increasing the voltage. At which light output should I say it is dead? At 0.9 V it is still bright enough that I can illuminate a paper in 1 m distance and read the text in darkness (about 1/8 of the max light power, but the eye is logarithmic, so it doesn't look that much darker). Would this be a good number? Below this it will decrease really fast anyway. The package says battery life time is 18 hours, so for the testing procedure might be sufficient to check it every half an hour or so with the lux meter, while using the other sleeve to create various curves. More complicated than I thought to define a good test procedure for a flashlight. |
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