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hi maukka, sorry to hear about the failed reassembly.
So the problem was just cells being unable to reach the measured (not displayed or actual) target voltage of 1.9 V? If yes, I have observed it with at least one cell way back when I got the charger, which was (notably) still uncalibrated at that point and mentioned it here. My solution, as described in this very thread, was just lowering the target voltage to the level at which the supposedly problematic cell would behave the same way as the rest of them. I assume it would work for your cells, too, would it not?lol Fake News (not by me!) about the alleged charging problem with NiZn batteries. all firmware versions behave the same correctly. the problem was the condition of the batteries, their chemistry was dormant. after cycling the batteries 5 times the charging is now proceeding as perfectly as expected and also terminates as it should.
clearly, there is no problem with the NiZn charging algorithm or termination in the firmware. :ironic:
I am glad that i was able to demystify the 'issue'
so if you guys work with NiZn, watch out for dormant specimen and cycle them 5 times (or more), for example with -0.50A/0.50A, and check how their condition improves as can be read from the charger's behavior, the graphs in pcls or dex. EDIT3: and charge with an appropriate charging rate, not too high; the lower the better for every party involved. basically i am saying that NiZn batteries *uck :devil:, lol.
this is my official all-clear. and i am deleting the k# from de list (EDIT1: done. moving on, bye). thanks for your attention.
EDIT2: squirrels are awesome :twothumbs
The problem was the high internal resistance of my small aged nizn batteries 130mO. At such a high resistance and high charging rates say 0.75A and higher, the voltage of discharged AA's would reach 1.90V within tens of seconds and then the algorithm would need to counteract the fast rising voltage with a steep amperage drop at the beginning of the CV-phase, then the current could be raised again to keep the voltage stable and eventually everything would calm down and settle and slip into a nicely decreasing current graph as expected. Depending on the parameters of your system such behavior is in fact predictable and could be modeled through process dynamics and control theory. With nizn batt ir there seems to be a critical dimensionless system variable composed of batt ir batt chemistry and charging current and other quantities which separates the normal CC-CV behavior from the aforementioned control theory response behavior. One doesn't need to go into theory or modeling or dimensional analysis lol, it'd be sufficient for all intents and purposes to conduct a series of systematic experiments to narrow down the boundaries of dimensionless number. Someone might find this observation interesting because we never observed such a control response with liion batteries no matter their batt ir and high charging rate. I am not sure if you guys really know what the term modeling in this kind of engineering simply means. Modeling in engineering means in the end practically nothing but setting up a mathematical model which in turn means nothing but setting up a concise system of partial differential equations which are capable of describing the entire system's behavior in the past, present and future, typically in a clear elegant way. In RL there is no explicit solution in equation form but when you feed the system to raspbian mathematica the numeric solver would at least suggest one solution in graphical form pretty amazing. It's a welcome exercise for sophomores but we can safely skip to the take-home message: nizn, when old or unconditioned, should be charged with a low charge rate, then the charging will go as expected. unless proven otherwise by an academic journal paper lol.
Well, for that you would have to read your post(s) aloud, wouldn't you? :wave:Sorry for the speech but sometimes i enjoy hearing myself talking lol
Equal capacitance, or equal charge voltage at the moment of charge disconnection by the Deltapeak detection. This would be also my recommendation for the correct charging voltage with the same charge current for the cut-volt method. Apparently, you've hit that value exactly when the capacity is nearly equal and the heating is lower. - That's perfect! :twothumbs
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basically that's how it goes yes, that's how i do it on my system (OS, cable, charger).
than it answered questions about the description. it was either useless to me this way, or i would have had to bombard sky with tons of questions regarding the doc. you can guess what i did
