I finally figured out how to do a comparative test of Crohn batteries. I hope someone else needs it.
After I conducted the "Grand Testing of AA and AAA Batteries" in 2014 (https://ammo1.livejournal.com/573394.html) I planned to test other types of batteries, but for various reasons I never did it for six years. Now I decided to return to tests.
I want to start with Krona 6F22 batteries, but there are two problems with them. The first is a voltage of 9 volts (Oleg Artamonov's analyzer, which I used to test other batteries, does not support voltages above 4.5 volts). I tried to make a voltage divider on two resistors, connecting the voltage measurement lines to the analyzer through it, but I ran into the second problem - for the Kron test, a sufficiently small current is needed, and the analyzer works at currents below 50 mA incorrect.
And then I decided to use a slightly modified EBD-USB + device for Cron. It also connects to a computer and can work in two modes: electronic load and consumption monitor. For Kron, it turned out to be better to use a constant resistor as a load, rather than a built-in load.
I conducted the first experiment with resistors with a total resistance of 123 ohms. The discharge current in this case is 34-74 mA (as the battery is discharged, the current decreases).
The alkaline battery took about 9 hours to discharge.
It turned out that the EB Tester program rounds the voltage and current values during calculations and the results are not entirely accurate: the screenshot shows that the battery gave 478 mAh 3351 mWh, and according to the results of calculations in Excel, slightly different values were obtained - 472 mAh 3390 mWh.
"Krona" is designed to power the load with low consumption, so I conducted a second experiment, discharging it with a 234 Ohm resistor (current 20-38 mA). With such a load, the discharge took 17.5 hours.
The result of 511 mAh 3720 mWh turned out to be 10% more than with a nine-hour discharge.
I think it would be correct to test all Crowns in this mode (all the more so as for salt the difference at initial currents of 74 and 38 mA can be very significant). Yes, for a long time, but more precisely.
I now have six batteries ready for the test (the Kodak salt I bought yesterday was not in the photo).
Alas, there is no point in testing 11 different Crones prepared for the test in 2014 - their shelf life has long expired (for salt ones already in 2015). Maybe "out of competition" I will test an old yellow IKEA with a shelf life of up to 2018 in order to understand how much energy remains in the battery, which is seven years old.
The testing process will start tomorrow. If all goes well, the results on six batteries will be within a week. If you have any thoughts before testing started, I would be glad to hear them.
© 2020, Alexey Nadezhin
The main topic of my blog is technology in human life. I write reviews, share experiences, talk about all sorts of interesting things. My second project - lamptest.ru. I test LED bulbs and help figure out which ones are good and which are not so good.