Test/review of Charger Miboxer C4-12

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HKJ
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Test/review of Charger Miboxer C4-12

Charger Miboxer C4-12

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Miboxer is a new brand in chargers, this model is a four slot universal charger with automatic current selection.

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I got the charger in a cardboard box

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The pack included the charger, a power supply, a mains cable and a instruction sheet.

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The charger requires 12V 5A power and has a usb power bank output.

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The user interface is a single button and a large display.
A short press on the button will switch between slots.
A long press on the button will allow adjustment of charge current for the selected channel (with short presses).
The interface is easy to use, but it is a lot of presses to select current for all slots.

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During power on all segments are shown.

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Charger is idle.
The background light will turn off after a short time, the first button press will turn it on again.

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During charge the display will show voltage, charge current and internal resistance.

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WHen using usb output the usb current is shown on the display.

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The charger has the usual slider construction. It can handle from 31mm to 73mm, this means even the longest cells. The large plus connection also means it can handle D and 32xxx cells.

supportedBatteryTypes

supportedBatterySizes

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Measurements charger


  • Power consumption when idle is 0.26 watt (Background light off).
  • Without power it will discharge a LiIon battery with 1-3mA depending on voltage.
  • Without power it will discharge a NiMH battery with about 0.2mA
  • A full LiIon battery will be pulsed with a few mA.
  • At 0V battery voltage the charger will charge with 1.5mA.
  • Above 2V the charger assumes LiIon
  • The charger will restart when a battery is inserted or power is cycled.
  • The meter is within 0.01V and works from 0.02V

Charging LiIon

Charging current: Auto, 0.1A, 0.2A, 0.3A, 0.5A, 0.8A, 1A, 1.5A, 2A, 2.5A, 3A

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A nice CC/CV charge curve with termination around 60mA. The tick on the curve is a internal resistance check.

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Display shows: 3181mAh, 173mohm, 4:40

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Display shows: 3095mAh, 77mohm, 3:57

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The other channels looks similar.
Display shows: 3054mAh, 111ohm, 4:22

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With the charger on auto it will select current depending on the internal resistance of the battery (And my measurement resistor). After about 10 minutes it do a IR check and increase the current slightly.

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This time it increase the charge current to 1.6A after a IR check.

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Again a nice charge curve.

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A slightly large cell that can easily hand a 3A charge current, the charger do a nice job.

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This very old and worn down cell is also handled nicely, with a very low charge current.

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With the automatic selection the charger is a bit slow to charge this cell, but it do get charged nicely.
Display shows: 727mAh, 322ohm, 3:57

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The charger can charge 4 cells at 3A, but these cells is heated significantly.

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Charging four cells at 3A requires nearly 5A from 12V. For the first test I used a 4A power supply, the charger handled that very nicely by reducing the charge current a bit.

Temp4811

M1: 46,1°C, M2: 47,4°C, M3: 49,5°C, M4: 47,3°C, M5: 46,5°C, HS1: 63,4°C
Charging 18650 at 3A means the batteries will generate some heat.

Temp4812

M1: 42,4°C, HS1: 50,5°C

PoweronLiIon

The charger uses a internal resistance check to decide the charge current and will then ramp the charge current slowly up.

CurrentChangeLiIon

It is possible to overide the current setting at any time.




Measuring Internal Resistance LiIon

RiLiIon

The results looks good and the consistency is also fine.



Charging NiMH

Charging current: Auto, 0.1A, 0.2A, 0.3A, 0.4A, 0.5A, 0.6A, 0.7A, 0.8A, 0.9A, 1A

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This is a nice -dv/dt termination with no top-off or trickle current.

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Display shows: 1641mAh, 69ohm, 1:58

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The 3 other also shows the nice -dv/dt curve.
Display shows: 1639mAh, 153ohm, 1:58

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I uses auto mode for this cell, the charge current was a bit low, but the charge looks fine.
Display shows: 2252mAh, 89ohm, 5:42

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A problem with using low charge current is a missing -dv/dt signal, but the charger terminates fine on this cell (I do not know if it is due to timeout or because it detects a full battery).
Display shows: 2814mAh, 171ohm, 15h

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Display shows: 1686mAh, 97ohm, 5:30

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I selected a very low charge current for this cell, the charger did not like it and reported error after some time.

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The AA is handled nicely.
Display shows: 637mAh, 104ohm, 2:14

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With -dv/dt it takes some time to detect a full cell.
Display shows: 54mAh, 224ohm, 0:12

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No problem with 4 cells.

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The charger uses about 1.5A from 12V to charge 4 cells.

Temp4821

M1: 34,4°C, M2: 33,9°C, M3: 35,5°C, M4: 33,7°C, HS1: 46,5°C

PoweronNiMH

The charger starts up with low charge current and after some time change to high charge current. This makes it possible to select low current before the charger switches to high current.
The total staring time is about 25 seconds.

ChargingNiMH

CurrentChangeNiMH

Current can be changed at any time. As is common with all NiMH chargers the current is turned off to measure the NiMH voltage.



Measuring Internal Resistance NiMH

RiNiMH

I have a bit problems with contact resistance here, especially on slot #3, but the final result looks fairly good.



USB output (Power bank)

  • Without power it will discharge a LiIon battery with 1-3mA depending on voltage.
  • Usb output is coded as DCP
  • Usb output uses slot #4 for power.
  • Usb output will turn off after 30 seconds with below 75mA load.
  • Usb output turns off when power is connected to the charger.
  • To keep display and usb power on requires about 42mA from the battery (17mA when background light is off).


Miboxer%20C4-12%20load%20sweep

With a full battery the usb output can deliver exactly 1A, before the output voltage drops. Overload protection kicks in at 1.5A

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The output voltage stays nicely at about 5.2V when I draw 0.5A

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With 1A output the boost converter has problems maintaining the output voltage, this is not very impressive.

10ohm

At 0.5A the noise is 106mV rms and 1244mVpp

5ohm

At 1A the noise is 159mV rms and 1615mVpp, this is way to much noise.

USBCurrent

The current display is not precise at low currents.

Testing with 2830 volt and 4242 volt between mains and low volt side, did not show any safety problems.



Conclusion

This charger can handle four 26650 LiIon cells at 3A, this is a very impressive charge current. It can either do automatic current selection based on internal resistance or current can be selected manually. For optimal charge speed manual selection must be used, automatic will use a high current for new cells and a low current for old cells.
The internal resistance measurement circuit works fairly well, especially on LiIon.
I wonder why the charger has a power bank function, the charger is too big to carry around and with only one cell feeding the power bank it cannot deliver that much output power. In fact it is a fairly weak power bank with a lot of noise.

I will give the charger a good rating.



Notes

The charger was supplied by Miboxer for review.

Here is an explanation on how I did the above charge curves: How do I test a charger

My website with reviews of many chargers and batteries (More than 1000): https://lygte-info.dk/

Sales-Miboxer
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Thank you for your hard work, nice review.

Please sent email any question:sales@miboxer.com

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Alright, more reading and checking member thoughts, HKJ's, testing helps.

I ordered one.

 

HKJ, thanks for your time in testing.

Box
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Thanks for the review HKJ.
I’m running out of space to store all these chargers I hardly use

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Quote:
M1: 46,1°C, M2: 47,4°C, M3: 49,5°C, M4: 47,3°C, M5: 46,5°C, HS1: 63,4°C
Charging 18650 at 3A means the batteries will generate some heat.

FYI, when charging 4x Samsung 30Q at 3A on mine, after about 20 minutes of charging, cell temps reached 52C (as indicated by the charger’s own display) at which point the charger rebooted itself.

Alas, I seem to be the only one experiencing this behavior.

SKV89
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HKJ, excellent review as usual. What is your opinion on this charger versus the Opus BT-C3100 v2.2? Does the C4-12 pulse charge like the Opus BT-C3100?

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ARsee wrote:

Alright, more reading and checking member thoughts, HKJ’s, testing helps.


I ordered one.


 


HKJ, thanks for your time in testing.

+1

HKJ
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SKV89 wrote:
HKJ, excellent review as usual. What is your opinion on this charger versus the Opus BT-C3100 v2.2? Does the C4-12 pulse charge like the Opus BT-C3100?

I like this charger, except the automatic current selection (Luckily it is easy to override).
It do not use pwm, but real current regulation.

My website with reviews of many chargers and batteries (More than 1000): https://lygte-info.dk/

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Pete7874 wrote:
Quote:
M1: 46,1°C, M2: 47,4°C, M3: 49,5°C, M4: 47,3°C, M5: 46,5°C, HS1: 63,4°C
Charging 18650 at 3A means the batteries will generate some heat.

FYI, when charging 4x Samsung 30Q at 3A on mine, after about 20 minutes of charging, cell temps reached 52C (as indicated by the charger’s own display) at which point the charger rebooted itself.

Alas, I seem to be the only one experiencing this behavior.

I got my C4 12 2 weeks ago. I charged 4 30Qs at 3 amps without problems. One cell got as high as 57c but cooled down as the charger reduced current at 4.2v.

klrman
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HKJ, thanks for another great review.  Just ordered the C4-12.  I just want to charge 4 x 26650 or 4 x 18650, all  protected cells, so would you recommend just manually setting it to 1.0A for safety?  I'm tired of 0.5A from my Xtar VC4.

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klrman wrote:

I’m tired of 0.5A from my Xtar VC4.

Same here, that’s why I ordered the C4-12 after reading HKJ’s review. I’ve been very impressed with the C2-6000 that I won in a giveaway, so that I also use it for 4-cell lights. But with the BLF GT due to arrive tomorrow, it will be a little tedious to charge four sets of two cells separately until I’ve received the larger model!

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I don’t know how to override the automatic current. I follow the instructions, set 3A (for example), but soon it returns to his automatic value.

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Giancarlo wrote:
I don’t know how to override the automatic current. I follow the instructions, set 3A (for example), but soon it returns to his automatic value.

The override the Auto mode, long press the button, but if you’re doing this and the charger won’t obey your chosen current rate, perhaps the cell’s IR is too high for the charger to follow your Manual current selection.

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tatasal wrote:
Giancarlo wrote:
I don’t know how to override the automatic current. I follow the instructions, set 3A (for example), but soon it returns to his automatic value.

The override the Auto mode, long press the button, but if you’re doing this and the charger won’t obey your chosen current rate, perhaps the cell’s IR is too high for the charger to follow your Manual current selection.

If you are right then it is the Auto mode that overrides the Manual current selection! About IR, I put in a slot a Sony 18650 VTC5A with very low IR but the charger continues to ignore my manual selections. It allows me to set the value I wish but then when the current appears again it displays the prior value. I tried to increase just from 0,40 to 0,50 but it returned to 0,40. I have two of this chargers and both behave in this way.
I also watched some video review on youtube and it happens the same! The reviewer did not realized it.

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Giancarlo wrote:
The reviewer did not realized it.

When I did the review the manual selection worked perfectly.

My website with reviews of many chargers and batteries (More than 1000): https://lygte-info.dk/

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I put some 18650 protected cells in yesterday and display was .15A, so I tried to bump it up to 1A and it would revert back to .15A.  Could be that the cells were 90% when I put them in and the charger needed to slow charge the last bit, I really don't know.  When I drain them down more I will be able to see if it still does that.  Battery spec sheet says these NCR18650B's can charge as high as 0.7C/2A.

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Time to pull the trigger on one of these.

Where’s the cheapest place to get one at the moment?

Also, I’m in Australia, do I require a cable like this to go from the power point to the power brick:

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klrman wrote:

I put some 18650 protected cells in yesterday and display was .15A, so I tried to bump it up to 1A and it would revert back to .15A.  Could be that the cells were 90% when I put them in and the charger needed to slow charge the last bit, I really don’t know.  When I drain them down more I will be able to see if it still does that.  Battery spec sheet says these NCR18650B’s can charge as high as 0.7C/2A.

When a battery is nearly full, the charger won’t charge it at the full current (I notice on low-resistance cells like my VTC6, it can still charge at a fairly high current when the display is showing like 4.15v), but higher-resistance cells will charge at a lower charge current. I believe this is the normal correct behavior of lithium-ion battery chargers.

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klrman wrote:
Could be that the cells were 90% when I put them in and the charger needed to slow charge the last bit,
Yup. That’s most likely what happened.
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d_t_a wrote:
klrman wrote:

I put some 18650 protected cells in yesterday and display was .15A, so I tried to bump it up to 1A and it would revert back to .15A.  Could be that the cells were 90% when I put them in and the charger needed to slow charge the last bit, I really don't know.  When I drain them down more I will be able to see if it still does that.  Battery spec sheet says these NCR18650B's can charge as high as 0.7C/2A.

When a battery is nearly full, the charger won't charge it at the full current (I notice on low-resistance cells like my VTC6, it can still charge at a fairly high current when the display is showing like 4.15v), but higher-resistance cells will charge at a lower charge current. I believe this is the normal correct behavior of lithium-ion battery chargers.

 

Pete7874 wrote:
klrman wrote:
Could be that the cells were 90% when I put them in and the charger needed to slow charge the last bit,
Yup. That's most likely what happened.

 

Then it is working fine, thanks 

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Pete7874 wrote:
klrman wrote:
Could be that the cells were 90% when I put them in and the charger needed to slow charge the last bit,
Yup. That’s most likely what happened.

Then also the so-called Manual Selection is Automatic! I don’t agree with this choice. There is an Automatic mode for who wishes it, but if I prefer a Manual mode I want it fully manual and not just when the charge of the battery is low and the IR is little. I have also the XTAR Dragon and the Opus 3100 vs.2 and the current I selected doesn’t change until the battery is fully charged.

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Giancarlo wrote:
Then also the so-called Manual Selection is Automatic! I don’t agree with this choice. There is an Automatic mode for who wishes it, but if I prefer a Manual mode I want it fully manual and not just when the charge of the battery is low and the IR is little. I have also the XTAR Dragon and the Opus 3100 vs.2 and the current I selected doesn’t change until the battery is fully charged.

Nearly all LiIon charger will reduce current when the battery i nearly full, I would give it a bad review if it did not. This can be seen on the curves in all my reviews.
The display may not show the actual current, but the selected current.

My website with reviews of many chargers and batteries (More than 1000): https://lygte-info.dk/

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HKJ wrote:
Giancarlo wrote:
Then also the so-called Manual Selection is Automatic! I don’t agree with this choice. There is an Automatic mode for who wishes it, but if I prefer a Manual mode I want it fully manual and not just when the charge of the battery is low and the IR is little. I have also the XTAR Dragon and the Opus 3100 vs.2 and the current I selected doesn’t change until the battery is fully charged.

Nearly all LiIon charger will reduce current when the battery i nearly full, I would give it a bad review if it did not. This can be seen on the curves in all my reviews.
The display may not show the actual current, but the selected current.

Yes, right, but as you say the display do not show any reduction of current. So the Mixboxer is the more honest charger on the market! Big Smile But often it does not respect the manually selected current also when the battery is charged at just 10% if the IR is high. Why does the hell it not let me decide? When I will need a behavior very respectful of batteries I will select the Automatic Mode.

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Giancarlo wrote:
[Yes, right, but as you say the display do not show any reduction of current. So the Mixboxer is the more honest charger on the market! Big Smile But often it does not respect the manually selected current also when the battery is charged at just 10% if the IR is high. Why does the hell it not let me decide? When I will need a behavior very respectful of batteries I will select the Automatic Mode.

 

I was just reading that charging the last 10%-20% or so of lithiums at higher amps can cause "bad things to happen".  This can be interpreted many ways, but for me it suggest the battery may flame out or blow.  Maybe they override our impulse to charge faster near the end purely for safety reasons only, which would be a good thing.  

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klrman wrote:
I was just reading that charging the last 10%-20% or so of lithiums at higher amps can cause “bad things to happen”.  This can be interpreted many ways, but for me it suggest the battery may flame out or blow.  Maybe they override our impulse to charge faster near the end purely for safety reasons only, which would be a good thing.

If you were to charge at high current toward the end of the charge cycle, you would be exceeding safe voltage levels. There is a reason why smart chargers use CC/CV charging algorithm for Li-Ion cells.
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Received mine today, and as expected after using the 2-bay model for a few weeks, I’m very happy with it. I put the 30Q’s from my BLF Q8 inside, and it started charging the cells that were eighty-something % full with 2.65A.

All four batteries made good contact with the sliders – can’t remember the exact IR, but it was somewhere in the thirties. I actually found that they slid into place perfectly, unlike most chargers that I’ve tried, where I often have to move the batteries about to get them in the best position.

The build quality seems really good, as well. I wasn’t quite expecting such a brick for the power supply, but I guess it makes sense if it needs 5A from a 12V connection.

The only thing that I’d like would be a clearly visible indicator that the charging process is complete – hopefully that is something Miboxer will add to future versions.

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Received mine hours ago today as well. The fast charging and possibility of charging four 26650s got me.
One problem though, I have a couple of older 26650 flat top Liitokala’s I was hoping to test out, but they won’t charge at all. The charger won’t recognize the batteries.
It recognizes my 18650s fine (a NCR18650B and some 35Es), but will do nothing with the 26650s.
Can someone help me out?


Wizard's First Rule: People are stupid.

klrman
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Had the same problem and had to bend the negative tab forward more to make contact as the wrap blocks the contact.

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Ooh, I was thinking about doing that but didn’t want to break anything. How’d you manage to do that? Pliers?

Yeah, you’re right, I just squeezed my finger between the bottom of the charger and negative tab and it does bend toward the battery and when it makes contact, charging does work.

Wizard's First Rule: People are stupid.

klrman
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I used pliers and held the base down with the square end of a 1/4" socket extension bar.  It bends fairly easy.

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I have exactly the same INR26650-50A cyan (although mine doesn’t indicate “Liitokala).

The INR26650-50A contacts does not touch the charger’s slider + or – contacts, you’ll need to carefully adjust the INR26650-50A at a slight angle until it touches the charger (forgot if it’s slanted towards the front or back, but try them).

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