| Electronics > Projects, Designs, and Technical Stuff |
| Batteroo testing |
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| FrankBuss:
I'm preparing the tests, cleaning and ordering the gear on my workbench a bit. And I bought some fresh AAA batteries, from different vendors, because the typical end user test would be important as well. Here is Dave's spreadsheet for entering test results: https://docs.google.com/spreadsheets/d/18K9c2YAT0d0QABGYGpzItbvDcgfAQCRUtloEzzfXADU/edit?usp=sharing I'll do some of these simple tests as well, as described in the spreadsheet. But it is difficult to find gadgets which run on 1.5 V AAA batteries. Most modern devices have accus, with USB charging, and many other devices I have use AA batteries. But I found a crusty old USB/MP3 player, you can see it in the image below. I tested it with a power supply and it turns off at about 1.12 V, when you lower the voltage slowly (works fine indefinitely at 1.12 V, but turns off randomly after some time at 1.11 V). Between 1.12 and 1.14 V it says "low battery when you try to turn it on at this level. At 1.14 V it turns on normally. Sound volume at the headphones is the same at 1.5 V and 1.12 V (but I'll verify this by measuring the voltage, will solder some audio rectifier and very low low pass filter to get an average of a few minutes for an automated test). With a typical application (playing "AC/DC - Highway to Hell" with max volume in an infinite loop), it needs about 70 mA. So a battery should be drained in less than a day. In the photo you can see the electronic load, the power supply, another power supply for -5 V (for the analog switch and if I need symmetrical voltage for op-amp circuits, like the audio rectifier), the benchtop multimeter and the Raspberry Pi, controlling it all, connected by ethernet so that I can ssh to it, and it has mounted a folder on my NAS (with RAID0 configured harddisks), to avoid wearing out the SD-card when logging for a long time. A RS232 TTL to +/-9V converter I built some time ago with a nice box connects the RS232 of the multimeter to the 3.3V TTL level pins of the first serial port on the Raspberry Pi GPIO headers. The second RS232 connection to the electronic load is implemented with a RS232 USB adapter. And finally the power supply is connected by USB, too. |
| razvanme:
--- Quote from: FrankBuss on December 17, 2016, 04:48:45 pm ---I'm preparing the tests, cleaning and ordering the gear on my workbench a bit. And I bought some fresh AAA batteries, from different vendors, because the typical end user test would be important as well. Here is Dave's spreadsheet for entering test results: https://docs.google.com/spreadsheets/d/18K9c2YAT0d0QABGYGpzItbvDcgfAQCRUtloEzzfXADU/edit?usp=sharing --- End quote --- I think step 2 and 7 combined might mess with the results, the dead batteries regenerate (I understand they don't recharge), even 1 minute of on time with a low load (1-2ma) might give batteriser a lead. I don't think it's fair to wait for them to regenerate. You should have another step 3.1 - Run the dead batteries from step 2 with batteriser and note the "extra" time if any. Although doing this, I don't know how you will calculate the final results ... hmmm :-//. I think you are already taking this into account in step 8-10. This depends on how long they will wait to be used. PS. Regarding the current reading, and not soldering to the sleeve. You can take any 9V battery, open it up, you will have a bit of metal strips that you can use, you don't have be a mechanic, you just have to take two, isolate them and slip them between sleeve and the battery. You can even make a smal indent in one to make good contact. |
| Towger:
--- Quote from: FrankBuss on December 17, 2016, 04:48:45 pm ---But it is difficult to find gadgets which run on 1.5 V AAA batteries. --- End quote --- I am sure Dave can DHL you a couple complementary EEVblog multimeters for side by side testing. One with and one without AAA size Batteroos.[emoji57] |
| CrashO:
It'l be interesting to see the results when they come in.. that's for sure :o |
| Mr.B:
Very interested in the results, so, bookmarked... |
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