My BT-C3100 v2 wont’ work without rework lol.
Gearbest support thinks slowly.
I originally purchased the Liitokala from Aliexpress (LK - the other smart charger - 2 bay) but after a string of bad discharge results, I REALLY regret the decision.
Just FYI, that charger (LK) gives a really poor discharge result every once in a while, even when it can only discharge at max 0.5A (which by itself takes a long time). Sometimes a new Sanyo cell gave 150mAh or something like that.
My Imax B6 gives proper result, so it’s not the cells. That LK charger really isn’t so good.
I am just gonna cut my losses and get this Opus anyway. Ordered.
EDIT: added LK and Imax charger name for clarity.
when is this ending?
this deal with the cr123 worries me-
what else will go wrong
i could not stop myself from buying one-
and i am trying to stop myself from buying another-
i remember you were discharging a cr123 that was
already down to 2.8V
what was the forum’s opinion about that
i got mine, looks great
Can’t remember exactly. But the cell was one I bought years ago and wanted to test. It started at 3.0 I think, drained under load down to 2.8 or so and when I came back it was up at 3.3 so I took it out. I tested it briefly in a light and it had charge. The mah count on the charger was at 1850 or so and it was definitely in a discharge mode.
I’m not really sure what the deal with it was. Could’ve been an old cell confusing the charger or a bug with the charger itself.
maybe you should try it again
why not try it again on another cr123 cell and make sure to select the “discharge” mode only…
Yea Gauss you must be right, that is in the manual. I didn’t realise there was a trickle charge so that would explain the v going up. Not sure why the mAh count was 1800+ though.
Tatasal I selected discharge, no doubt about it.
Mine seemed to have an issue last night doing a charge test with 4 brand new AA Eneloop Pro cells. I put them in the unit last night after about a month of sitting after being fully charged, so they shouldn’t have spent long on the first charge cycle before starting the discharge test.
After several hours I noticed that they were fully charged and the voltage on all 4 was fluctuating slightly, going up and down about 2 tenths of a volt in about 15 minute increments. The charger was definitely confused, so what I did was set all 4 slots to discharge and I got the test results I was originally expecting: all 4 cells > 2400 mAh. For whatever reason it didn’t think any of the cells were charged and wouldn’t start the discharge portion of the test. The auto-detect algorithm probably has a bug.
It hasn’t glitched before or since and I’ve put probably hundreds of batteries through it total—testing cells pretty much non stop since I got it. It’s an OK charger, but it’s turning out to be a superb testing tool.
you might be able to put the cr123 ( at 2.8V ) in the charger and
select charge. it might assume to charge to 4.2 and maybe stop when full or you have to keep an eye on it around 3.2V.
—
and what happens with a quick test on a 3.0V primary ?
465 units ordered as of this posting…. 
Not much away from 500…
great!
Okay, after receiving it a couple of days ago, today I did some more testing.
Just now I discharged 4 18650’s at 1A
The discharge capacity shows higher than the rated capacity, this could be possible and I will confirm this with a discharge on my accucel-6 later.
But for some reason, one of the batteries, in slot 2, suddenly shows as if it was never discharged. Time is 0, capacity is 0.
Really strange, and I don’t know why. When I checked 20 or 30 minutes ago it was just discharging normally like the rest with a similar discharge capacity as the rest
I’m now doing a 700mAh charge (due to the charger only being 3A, I hope this will give better results than 1A since it won’t be able to deliver 4x1A)
Let’s see how it goes.
Yea, I had some of those issues too. The timer never starts, or plays up like that.
Well, the capacity it put in the batteries while charging is less than the number it showed when discharging.
Maybe the discharge function suffers from the same issue as charging with more than what the power supply can deliver?
Charge/Discharge indicated capacity comparison between stock 3A P/S vs 15A cheese grater style P/S. Cells are new but vintage Samsungs laptop pulls with capacity of 2405mAh (4.2v) @ 1A
Cells were cycled fully three times prior to collecting data and remained mostly unmolested in their respective slots. After each charge/discharge cycle, the P/S were exchanged then cycle repeated.
| 15A P/S |
| Charge/Dischrg Charge/Dischrg Charge/Dischrg Charge/Dischrg |
| Current 1A / 1A 700mA / 1A 500mA / 1A 200mA/200mA |
| Cell #1 2478 / 2497 2420 / 2505 2463 / 2506 2488 / 2361 |
| Cell #2 2443 / 2514 2372 / 2522 2392 / 2506 2442 / 2389 |
| Cell #3 2474 / 2497 2412 / 2505 2449 / 2489 2480 / 2349 |
| Cell #4 2468 / 2497 2408 / 2505 2463 / 2490 2484 / 2379 |
| 3A P/S Stock |
| Charge/Dischrg Charge/Dischrg Charge/Dischrg Charge/Dischrg |
| Current 1A / 1A 700mA / 1A 500mA / 1A 200mA/200mA |
| Cell #1 2703 / 2471 2658 / 2507 2442 / 2489 2494 / 2353 |
| Cell #2 2657 / 2488 2596 / 2523 2445 / 2489 2437 / 2372 |
| Cell #3 2649 / 2455 2610 / 2490 2507 / 2489 2469 / 2332 |
| Cell #4 2734 / 2455 2654 / 2507 2481 / 2473 2478 / 2364 |
Hmm, doesn’t really seem that much of a difference between discharge with different psu’s
I discharged the first cell on my accucel with 1A
it got 2714 on the opus and 2544 on the accucel. Accucel was set to discharge to 2.8V. But in past tests I noticed the accucel shows a lower voltage so right now I’m doing a second discharge on another cell discharging it to 2.7V
I’m also doing another discharge on the opus with 2 cells 1A right now. Let’s see if that makes a difference.
Well, they both started at the same time.
After 2.5 hours the accucel is done with a result of 2541mAh. These are 2600mAh rated batteries.
The opus is still discharging and measured a battery voltage of 3.4V at the same time the accucel announced it’s stop.
Both did a 1A load.
Either the accucel really measures a way to low voltage, or the opus measures a way to high voltage or just does not discharges with a real 1A load but does use this for calculations. And although my accucel does measure a bit lower, it’s only 0.1V difference with my multimeter, not a 0.7V difference as it is with the opus at the same load.
Seeing that the capacity I got with charging was around 26something and the accucel is as I’m typing this at 2700, I am almost sure my opus does not discharge correctly with 1A, even with only 2 batteries inserted.
I’ll see if I can do a 0.5A discharge tomorrow to see if the results come closer to reality.
Will also try to test if I can test other batteries. But it might not be until after the weekend.
And seeing that most problems with wrong capacity I’ve read about where with showing a higher charged capacity and a normal discharged capacity, I’m not that happy :~
I could live with a wrong charge capacity, but the discharge values should be correct 
edit: the opus just stopped discharging when I finished typing this.
2 hour 42 minutes 2700mAh
2 hour 45 minutes 2744mAh
On the accucel I got 2 hour 32 minutes 2541mAh
The batteries are all from the same batch
474 units