what are you saying—that it will only fail with a 3400mah cell—- Ive done 100s of cells without any kind of failure that you’re talking about—just recently tested and matched 26/ 30Qs not one interruption—that’s with the stock(better PS)
For the most part YES. I have to do more testing to see how this one will fare,I would think the same results as the other 2 that did this: As long as it is NOT 4 X 3400mAh it can usually handle it, although Jon had ones reset w/ 4 X 3000mAh.
I will bet when I discharge 2 or 3 of the same batteries the results will be more accurate.
Two Issues with these chargers.That have been determined with a lot of help from others and my vigorous testing and stats!
1.Resetting near the transition from discharge to charge[this has prompted Jon NOT to discharge 4 x 18650]SOLUTION: My LITE-ON SMPS 12V/5.5A/66W.
2. The charger STOPPING because it is too hot and only resumes when the temp. is below 40C/104F. SOLUTIONS: a fan with excellent CFM[Ability to move air],Delta 12v/0.12a/1.44watts!
I have experienced that with 3 out of the 4 Opus.chargers I have had
To start off with your charger is stopping it’s discharge way before the end(heat) and restarting— so cell size has nothing to do with it
All I know is I have two of them and they work perfect—good luck with all your testing
I’ll admit I am a bit confused… not terminally confused mind you, just a bit confused.
1. The initial problem mentioned was a “reset” shortly after the discharge cycle had ended & the charge cycle had begun. This problem was identified as happening when 4 x 18650 cells were being tested.
This is what my charger was doing also, nothing more.
The solution to this was replacing the inadequate power supply with an adequate SMPS.
As far as I can recall, no mention was made by anyone at the time of their charger stopping during discharge because of “heat” related issues.
Sooooooo….
2. Is this a newly discovered issue?
Mine has not & does not do that. When was this issue first discovered?
You’re still not explaining why the heat is building up and shutting the charger off early in the Discharge cycle—at that point the charger has no idea what size the cell is—I usually don’t read manuals(I don’t have those problems—why would I)—when something gives me too much trouble —I toss them
That is all well and good. But none of it answers the questions I asked.
In addition mine does not do it with 4 x Sanyo NCR18650GA’s…. 3500mAh each. 4 x Sanyo GA’s [3500mAh ea.] = 14,000mAh … Additional 400mAh from the K’powers
teacher——-I tried to answer you as far as I know from reading here—I thought the first instance of the New problem was when Wolfdog tried the replacement fans—yesterday he mentioned that other 3100 had this shutting down on discharge problem
gauss163—I thought about the IR after my last post—most of my cells are low resistance—as far as ambient temp—I have mentioned my wife keeps this house like a meat cooler—-one of the things I see is—all of his chargers are/maybe coming from the same lot
the only way I could make my 3400 replicate the first discharge/charge reset was to use my Littokala 2amp PS—-with this PS as soon as you tried to charge 4 cells @ 1 amp it reset
I understand teacher! Your charger is just like King Opus that I killed,It has NO issues,be grateful. I have had 2 chargers that could not handle 4 x 18650,that is why I am determined to get this one or another one working like it should.
The results I post later will show the difference b/w 3 or 4 batteries discharged when you have a charger like the one I have now. Lastly, Jon only discharges 3 batteries at a time because of this issue and the other[reset] that I mentioned in a post yesterday!
HKJ and I have been exchanging emails/photos of my board. He has been tremendous help in pin pointing the destruction of King Opus. I will post that later.
I am testing 4 X 30Q Now,10 cycles only,basically new. I will find out soon enough if it stops or if it can handle 12,000mAh. It could not handle 13,600mAh[4 x KP 3400.
_
Although not mind boggling this will give you an idea what the difference is in charging 3 X 18650 3400 VS. 4 X 18650 3400. Same KeepPower batteries.
I believe this is evidence that numerous stoppages during discharge directly relates to over blown and inaccurate capacity readings.
- 4 X 18650 3400mAh Keeppower-Numerous stoppages ~15 lasting 90 sec. to 2 minutes.
Four slot median:3278mah
Average time: 3h55m
–3 X 18650 3400mAh KeepPower
Four slot median: 3096mAh
Average time: 3h3m
Difference: 282mAh and 52 minutes longer for the 4 x 18650 3400mAh
Obviously the stoppages ADD time and the also add mAh because as the battery rests, the voltage goes up ~0.03v to 0.06v and that is measured AGAIN!
The solution, other than what I am trying to do[Delta destroyer] is to do what Jon does and only put 3 batteries in!! I can not accept that,at least now I won’t!
And a stellar job you did my Louisiana friend. :+1: … Thank you.
All I was attempting to ascertain was when the heat problem was first noticed as wolfdog has now mentioned it has happened in 3 of his 4 OPUS chargers.(1)
“I” did not recall any of that being mentioned until the last day or two.
So I was trying to determine if this had been an occurrence all along and just not been mentioned OR if I had missed the mention of it in all this vast quantity of material.