Sick and tired of Opus. Is there a reliable, accurate and safe charger cheaper than MC3000?

ven · 2019-01-25T16:13:35.000Z

The c4-12 is a decent charger, only short fall so far are weak slider springs. Can snap after a bit of use(took 6m for me), but easy to fix/repair.

CMU_84 · 2019-01-26T02:13:16.000Z

Does the Miboxer C2-4000 have weak slider springs? I’m ready to purchased one next week from Amazon.

blueb8llz · 2019-01-26T02:28:35.000Z

I’m looking for a new one as well. I was thinking either the liitokala 500 or the efest luc.

RobertB · 2019-01-26T03:44:28.000Z

I’ve had an Opus BT- C3100 2.2 working great and reliable for the last 4 yrs. 45C doesn’t sound like it’s over heating to me. Start worrying if it hits 80C. You can get 45C just about any cell with a 1A discharge. Especially a cell like an NCR18650B or a no name chinese cell with a higher internal resistance.

tundraotto · 2019-01-26T04:29:14.000Z

Liitokala Lii-500
Nitecore UMS4

ven · 2019-01-26T05:26:45.000Z

CMU_84:

Does the Miboxer C2-4000 have weak slider springs? I’m ready to purchased one next week from Amazon.

I would have thought same springs, but dont have that charger to compare.

I have had 3 of them break where they attach to the slide(post end are fine, just popped off when back removed)

Easy fix, i actually got a spring kit in the end. Little tricky to adapt to hook in and do feel more resistance now when placing larger cells in. Hopefully the posts will be strong enough. It frustrates me no end, especially when a good charger, using cheap beep internal parts. In fairness, its took quite a bit of use(used daily 7 days a week , at least 2 bays and more than once a day).

That is the only fault i can find, the auto select from the IR has proven accurate, once tested the terminating V (little low at 4.18 but no issue) and no trickle charge(which it should not, i take no chances though). The ease of just placing a cell in, leaving to do its thing has been great.

ven · 2019-01-26T05:29:44.000Z

RobertB:

I’ve had an Opus BT- C3100 2.2 working great and reliable for the last 4 yrs. 45C doesn’t sound like it’s over heating to me. Start worrying if it hits 80C. You can get 45C just about any cell with a 1A discharge. Especially a cell like an NCR18650B or a no name chinese cell with a higher internal resistance.

Me also Robert, my 3100 v2.2 has been excellent and issue free. Cant fault it in reliability at all, only down side now is it feels cumbersome having to press buttons!! This is a charger i have recommended in the past, still believe its one of the better chargers for near $30 out there.

RobertB · 2019-01-26T05:35:57.000Z

ven:

RobertB:

I’ve had an Opus BT- C3100 2.2 working great and reliable for the last 4 yrs. 45C doesn’t sound like it’s over heating to me. Start worrying if it hits 80C. You can get 45C just about any cell with a 1A discharge. Especially a cell like an NCR18650B or a no name chinese cell with a higher internal resistance.

Me also Robert, my 3100 v2.2 has been excellent and issue free. Cant fault it in reliability at all, only down side now is it feels cumbersome having to press buttons!! This is a charger i have recommended in the past, still believe its one of the better chargers for near $30 out there.

Non protected 21700 even fit it. And it came out long before 21700’s did.

Alexium · 2019-01-26T12:45:57.000Z

RobertB:

45C doesn’t sound like it’s over heating to me. Start worrying if it hits 80C.

It never did that before. This is a somewhat worn-out Sanyo cell, specced at 2000-ish mAh, some 1500 left in it. It could get slightly warm, 34-36 C, perhaps, but never hot. And the most bizarre is not the fact that it got hot but the circumstances. It was charging at 500 mA, the process was some 30 minutes in, it was nearing the switch from CC to CV. Voltage reading was something like 4.13 V. In fact, I think it might have switched to CV already but I’m not sure. Then I went out for ~50 minutes, and when I’m back it’s at 500 mA and 4.1 V, and the cell is hot. Clearly, it’s not normal for the voltage to go down during charging, the charger should have detected that as a suspicious behavior and stopped charging.

I restarted the charger, let the cell cool off and reinserted it. I discharged it with 1 Amp for several minutes and it didn’t even start getting warm, the voltage was fine as well. Then I charged it with 500 mA, just as I tried before, and it went without a hitch. Does anyone have an explanation what has actually happened? I don’t understand what was going on and why it got warm.

Also, CC/CV charging for 1.2 V cells is a joke, they might have as well said they don’t support NiMH/NiCd at all. It always overheats my Eneloops, so I have to break out Opus for Li-Ion and the good old LaCrosse BC-450 for NiMH, it gets tedious and a waste of time and space to have to fiddle with both. Combine this with significant error in voltage reading, and you may see why I can’t recommend this charger to anyone.

Sirstinky · 2019-01-26T13:01:49.000Z

I really like my Zanflare C4. Had it 2 years. It does everything you could need except it doesn’t have a dedicated discgarge mode and the max current is 1000 mah on 4 slots. It’s reasonably accurate on the calibration, and seems to slightly undercharge my batteries (+/- 0.1-0.2v) which isn’t terrible. Charge, analyze, 2 test modes current 300, 500, 700 and 1000 mah, 0v battery recovery. Around $30 on Amazon. If you want discharge lps, Nitecore SC4, MiBoxer c4-12, or xtar dragon.

bushmaster · 2019-01-26T14:58:02.000Z

CMU_84:

Does the Miboxer C2-4000 have weak slider springs? I’m ready to purchased one next week from Amazon.

I’ve been using the C2-4000 as my every -day charger for over a year with no problems. Nice charger.

robertsig · 2019-01-26T15:09:44.000Z

I have the newest Opus BT-C3100 myself and while it works good, I'd prefer something slightly simpler with better information on the LCD. As it stands now, I won't let my kids charge batteries since I have to choose my preferred settings (each time) for the 18650's and Eneloops.

I'm a battery noob, but one of the reasons I bought the Opus was the breadth of features such as discharge and refresh. However, I'm not sure if I need it. Is there a reason to have that for modern 18650 3400mAh or Eneloop AA/AAA batteries?? I'd love to buy the new MiBoxer C4Plus but I understand it doesn't have that feature. Is there any reason I would miss it considering my battery choices?

The MiBoxer also seems to tick the most boxes for the OP. Is there a better “plug in and forget”...yet SMART...charger on the market?

Tom_E · 2019-01-26T15:24:32.000Z

I got 2 MC3000's, had them for a while, and really love them. I don't know what you are talking about with complicated profiles - thought mine were easy to setup. I never use the BT phone I/F, do everything from the panel - easy. What's great is the 3 amp charging on those big 5500 26550 cells, and the minute charge levels for the 10440's. The 21700's fit, though it's a tight fit, but been charging a ton of them - got wide variety of brands.

I try to keep the settings on the 2 units in sync, and "profile 1" is the lowest level, up to profile 10 or so for 2.8 amps. Above 10 is for NiMh, etc. Of course I got about every possible cell in LiIon, so needed to use 10 profiles with differing charge rates, but think it goes up to 20 or so.

I usually set my charge level to 4.22V, because by the time you take the cell off, it's dropping, or drops a little after removing it, depends on the cell - older ones typically drop more. Most come off at 4.20, some at 4.21, older cells or poor ones like many of the 10440's and 16340's come off at 4.18 or 4.19.

BlueSwordM · 2019-01-26T15:51:49.000Z

Just set it to 4,20V.

The voltage level doesn’t really matter when it has completed the CV phase.

The reason the voltage drops, as you probably already know, is that the cell’s internal resistance comes into play once it’s not subjected to a potential difference.

Therefore, even fully charged, the cell voltage will drop it a little. As long as it doesn’t go below 4,17V when you instantly remove it from the charger, and you are good.

For lithium-ion cells, and NiMH cells, internal resistance goes down as the voltage goes down. So it’s not actually bad, since under heavy load, instead of dropping 4,20V to 4,09V, the cell drops from 4,15V-4,09V.

It is a strange phenomenon indeed, but a good one.

Tom_E · 2019-01-26T16:03:50.000Z

BlueSwordM:

The reason the voltage drops, as you probably already know, is that the cell’s internal resistance comes into play once it’s not subjected to a potential difference. Therefore, even fully charged, the cell voltage will drop it a little.

No, never heard of that. When I test lights, I like using 4.19V to 4.21V at a starting point. Never heard anyone say that off the charger, 4.15V is the same as 4.20V - just doesn't ring a bell. Guess there's still a lot I don't know, though I sure would like some tech ref info on this, again, because I've never seen that written here on BLF, least I can recall, and I'd think that would be something important to me.

CMU_84 · 2019-01-26T16:43:52.000Z

@bushmaster Thanks for the feedback, really helps to confirm my decision.

Alexium · 2019-01-26T16:48:50.000Z

bushmaster:

I’ve been using the C2-4000 as my every -day charger for over a year with no problems. Nice charger.

Have you checked the voltage reading accuracy with a DMM?

bushmaster · 2019-01-26T17:20:23.000Z

Alexium:

bushmaster:

I’ve been using the C2-4000 as my every -day charger for over a year with no problems. Nice charger.

Have you checked the voltage reading accuracy with a DMM?

I have on several occasions. Always within a hundredth or two. Consistently charges my unprotected 18650s to 4.18. The only issue with it ( and this has been discussed ad infinitum in previous threads on BLF) is its insistence in analyzing button-top batteries as having high internal resistance and charging them at a slower rate when on auto. I don’t use button-tops that much so it doesn’t bother me and of course I can always kick the amperage up manually if I want.

Alexium · 2019-01-26T17:22:01.000Z

The auto mode seems a gimmick anyway, unless you’re in a real hurry, IMO.

RobertB · 2019-01-27T18:36:45.000Z

Alexium:

RobertB:

45C doesn’t sound like it’s over heating to me. Start worrying if it hits 80C.

It never did that before. This is a somewhat worn-out Sanyo cell, specced at 2000-ish mAh, some 1500 left in it. It could get slightly warm, 34-36 C, perhaps, but never hot. And the most bizarre is not the fact that it got hot but the circumstances. It was charging at 500 mA, the process was some 30 minutes in, it was nearing the switch from CC to CV. Voltage reading was something like 4.13 V. In fact, I think it might have switched to CV already but I’m not sure. Then I went out for ~50 minutes, and when I’m back it’s at 500 mA and 4.1 V, and the cell is hot. Clearly, it’s not normal for the voltage to go down during charging, the charger should have detected that as a suspicious behavior and stopped charging.

Maybe you got a dud charger, but maybe it’s time for a new battery. To be honest, after purchasing the Miboxer C8, I set my Opus for 3.7v, and use it only to discharge cells for long term storage. I drilled a hole in the bottom of the Opus for access to the switch.