Using the Analyzer of chemical current sources Yarostanmash ASK2.5.10.8, I tested all the batteries in the discharge mode with a resistive load of 10 Ohm to 0.7 V (during the discharge, the current dropped from 160 to 70 mA).
The first I tested IKEA ALKALISK AAA batteries (release date 10/09/20, expiration date 10/09/25).
To be honest, the result amazed me.
The best specimen is 1023 MWh, the worst is 925 MWh. The difference is 9.5%. Nine and a half percent, Karl!
This means that when one unit of batteries is tested and the conclusion is made that the battery of the “A” brand is 5% better than the battery of the “B” brand, everything depends on the specimen that comes across. If others were caught, “B” could have turned out to be better than “A” by the same 5% with the same success.
The second I tested the Foton Alkaline AAA batteries (expiration date 06.2027, release date presumably 06.2020).
The result brought back faith in humanity.
The best example is 1508 MWh, the worst is 1477 MWh. The difference is 2.1%.
Finally, I tested eight Ergolux Alkaline AAA batteries (expiration date 09.2025, release date presumably 09.2020).
Result.
The best example is 1233 MWh, the worst is 1189 MWh. The difference is 3.5%.
From all this, I can draw the following conclusions:
- All copies of batteries differ in capacity and this difference can be up to 10%;
- Perhaps by the difference between the copies, one can judge the general quality and level of production;
- IKEA batteries are no longer a cake.
I think that now it will be correct and sufficient to test 4 batteries of each type (preferably from two different packages).
In 2014, I did the "Grand Testing of Batteries" and now those results are no longer very relevant: the batteries of some brands have changed, new brands have appeared.
I want to re-test many types of batteries in more correct and relevant modes, with four of each type in each mode.
There are probably two test modes:
Discharge 3.9 Ohm to 0.9 V (current drops from 400 to 230 mA) - this is a standard Chinese test for AA batteries. I think it would be correct to apply it to AAA batteries, because they are now used everywhere, including where AA used to stand.
Discharging 10 ohms to 0.7 V (current drops from 160 to 70 mA) is a "maximum capacity" test showing how much power the battery can deliver under light load.
In the near future, we plan to test the most expensive, cheapest and most popular AA and AAA alkaline batteries. Dear ones, these are Duracell, Varta, GP, Energizer. Cheap - FLARX, Auchan, IKEA, as well as the cheapest alkaline batteries from Ozone and Wildberries. Popular - top sellers on the same sites.
© 2021, Alexey Nadezhin