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Thread: Test/Review of Charger Xtar VC4

  1. #1
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    Default Test/Review of Charger Xtar VC4

    Charger Xtar VC4





    Xtar makes many LiIon chargers, this is a usb powered quad channel charger with display. The charger can charge with up to 1A for two channels or 0.5A for four channels, actual current depends on slots used and available usb power. It supports both NiMH and LiIon cells.



    I got the charger in a cardboard box with the specifications printed on it.



    Inside the box is a fabric bag with the charger in, this can be useful for traveling and to keep the manual, charger and cable together.



    The bag contained the charger, a cable (charger to usb), a warranty card and a instruction manual.



    The charger is usb powered, but the connector is a DC barrel connector, i.e. you need the supplied cable to connect the charger. I would have preferred the ability to use a normal usb cable. The DC barrel connector is not compatible with the one used on the 12V chargers, i.e. there is no risk of connecting a 12V power supply from another Xtar charger to this charger (Very good).
    Another way to handle this would have been to make the charger accept both 5V and 12V power.

    I got no USB power supply with the charger (Xtar say that they will also be selling a compatible usb power supply). I have tested some usb power supplies and it is possible to find a useable one on my list (Remember it must supply at least 2A for full charge speed).



    There is a display, four red/green leds and one button. The button has a couple of functions:
    1) Restore full background light on the display (The light will dim after a short time).
    2) Turn the background light/display off or on, a long press will turn it off, any press will turn it on again.
    3) Select what slots are displayed, this is only necessary if more than two batteries a charged simultaneous.
    The leds are red while charging and green at all other times. This makes it very easy to see when a slot is finished.



    The display uses dials to show voltage and maximum current, it does also have some 7 segment digits to show charged capacity and slot number.



    The current dial only shows the maximum charge current, the actual current is lower when the battery is in the CV phase.
    The voltage dials shows the actual voltage when in range:
    0V Battery voltage is low, charger is only using low current, display may show "Err" if there is a problem with the batteries.
    3.0V Voltage is high enough to start regular charge.
    3.5V-4.2V Regular charge, display is within 0.1 volt.
    If the charger only has two batteries in it, the display will always show them, independent of slots used, with 3 or 4 batteries the switch must be used to select between them.



    The charger can handle both button top and flat top batteries.
    The slider moves smoothly and can hand cells from 30mm to 71 mm long.









    The charger can handle 71 mm long batteries, including flat top cells.



    Measurements charger


    • When charging the last digit in the capacity displays will flash.
    • The charger will charge with 100mA from 0 volt and display will show NiMH
    • Charger will not stop NiMH charging within the first 10 minutes.
    • Above 2.0 volt the charger assumes LiIon battery.
    • Between 2.0 volt and 2.9 volt charge current is 120mA on 1A range.
    • Above 2.9 volt the full charge current will be applied.
    • When charge is finished the charger will charge with 0.2mA.
    • The charger steps charge current down when the usb voltage at the charger is below 4.7 volt.
    • Charger will restart if voltage drops to 3.9 volt.
    • Charge will restart charging after power loss, or battery insertion.
    • When not connected to power it will drain about 0.6mA from a LiIon and 0.2mA from a NiMH battery.
    • Current dial will show maximum possible charge current, not actual charge current.
    • Voltage dial will show within 0.1 volt when voltage is in range.
    • The 3 volt position on the voltage dial looks like it signals "start of regular charge", i.e. 2.9 volt.
    • mAh display flashes "Full" when the corresponding battery is full.
    • With only slot #1 and #4 in use maximum charger current is 1A
    • With slot #2 or #3 in use all slots are limited to 0.5A charge current.


    The light green line is usb current consumption, the dark green is charge current.

    Charging LiIon



    The charger does a nice CC/CV charge with a termination at about 70mA. The changing DC input current shows that this charger is using a switching charge regulator.
    The display shows 2807mAh charged into the battery.





    The other channels has a similar result. Slot #2 and #3 is charging with 0.5A. The termination current is the same on all slot at around 70mA
    The display shows 2791mAh, 2776mAh and 2784mAh charged into the battery.



    The 2600mAh battery has a long CV phase, probably because it is getting old.
    The display shows 2172mAh charged into the battery.



    The 3400mAh takes slightly longer to charge.
    The display shows 3047mAh charged into the battery.



    The charger has no problem with my old IMR cell, but there is not much capacity left in it.
    The display shows 154mAh charged into the battery.



    The 18350 cell is better, I uses slot #2 to limit the charger current to 0.5A
    The display shows 695mAh charged into the battery.



    The 14500 is also charged in slot #2
    The display shows 754mAh charged into the battery.



    Charging 4 LiIon cells at the same time is a rather slow, because the charger turns the charge current way down with my power supply and wires.
    The display shows 2407mAh 2498mAh 2566mAh 2518mAh.



    Increasing the usb voltage to 5.2V to compensate for wire losses improves the charge speed.
    The display shows 2781mAh 2764mAh 2884mAh 2857mAh.



    Supplying a falling voltage to the charger shows that the current regulation starts reducing the charge current rather soon, this is due to resistance in the cable and connection.



    M1: 28,6C, M2: 30,9C, M3: 30,6C, M4: 29,1C, M5: 31,1C, HS1: 37,1C
    The charger does not heat the batteries much during charge.
    To do these photos I uses this usb power supply, it maintains the output voltage slightly above 5 volt, this allowed the charger to use full charge current.



    M1: 28,2C, M2: 30,0C, M3: 30,0C, M4: 28,1C, HS1: 35,2C
    As usual the power connector get warm, but here the heat is very limited.



    The charger needs about 10 seconds to start.



    The 1A current is steady, no pulsing is used.



    The 0.5A charge current is a reduction of charge current, not pwm regulation.



    Charging NiMH



    The charger was a bit doubtful about my 5 volt power supply and did reduce the charge current a couple of times.
    The charging terminates on voltage and then does a top-off charge, as can be seen in some of the other curves this top-off takes about 2 hours. It is done after the charger reports done.
    Display shows 1605mAh




    The two 0.5A channels works the same way.
    Display shows 1627mAh 1673mAh



    The last channel accepts my power supply and uses full charge current all the time. On most of these charts it looks like the temperature is starting to raise, just before the charger terminates, this means the battery is fully charged.
    Display shows 1661mAh





    With these batteries the temperature raise is obvious.
    Display shows 1750mAh 2312mAh 2209mAh



    Here I am missing the temperature raise, i.e. the termination is a bit premature.




    The charger can detect a full cell within a few minutes when it starts charging, but because the 10 minutes precharge it takes some time to detect the full cells.



    With 4 cell the charger cannot get enough power from my 5 volt supply (due to cable and connection resistance), it need a bit more volt for full charge current.
    Display shows 1676mAh 1683mAh 1746mAh 1720mAh



    Raising the voltage a bit gets the charger up to full speed.
    Display shows 18526mAh 1919mAh 1858mAh 1834mAh



    Adding an extra 0.5ohm resistor in series with the power supply did not work, the charger needs a better power supply than that.



    M1: 29,9C, M2: 31,4C, M3: 31,3C, M4: 29,6C, M5: 32,3C, HS1: 38,7C
    Also NiMH cells stays very cool during charge.



    For NiMH it takes 8 second from power on to precharge is started.



    The precharge runs for 10 minutes, before regular charger kicks in.



    Precharge is about 120mA with pulsing each second.



    1A charging has the same pulsing and uses 1A as charge current in the pulses, average charge current will be a bit lower due to the pulsing.



    0.5A charging reduces the current, there is no pwm regulation.



    The two hour top-off charge is done with pulses.



    And the current depends on the charge current.



    Charging LiIon and NiMH

    Mixing LiIon and NiMH cells in the charger is no problem.



    In the above curve I measure on the NiMH cell (Except temperature that is on a LiIon), the NiMH finished first.



    In this curve the NiMH finished first (the DC input current drops) and I continue recording the LiIon data.


    Because the charger is supplied from usb power there will not be any safety issues with it, but be careful with the usb power adapter.



    Conclusion

    The charger is very good at both LiIon and NiMH charging and keeps some impressive low cell temperature during charge (Like the VC2).
    For charging at full current the charger is fairly demanding of the used usb power supply. It is possible to use weaker supplies, but the charging will be slower or sometimes much slower. With the current dial it is easy enough to see when that happens and it is time to get a better usb power supply. I would have liked slightly better performance with weak usb power supplies.

    This type of charger is what I will call a family charger. Nearly anybody in the family can use it, just put the batteries into the charger and wait. Only caveat is that small batteries go into the two centre slots or, for sets of four, in all four slots.

    Final conclusion must be that it is a good charger.



    Notes

    The charger was supplied by XTAR for a review.

    Here is an explanation on how I did the above charge curves: How do I test a charger
    My website with battery, charger, usb reviews, comparisons & information: https://lygte-info.dk/
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    Default Re: Test/Review of Charger Xtar VC4

    staggering thoroughness

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    Default Re: Test/Review of Charger Xtar VC4

    As always, thanks for the review.

    I'm a little mystified...a USB-powered charger that doesn't use a standard USB cable/connector is an odd choice. Especially when performance is seriously degraded without a high-powered and voltage-controlled source. Am I missing something? Why is this a good idea?

  4. #4
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    Default Re: Test/Review of Charger Xtar VC4

    Quote Originally Posted by thedoc007 View Post
    As always, thanks for the review.

    I'm a little mystified...a USB-powered charger that doesn't use a standard USB cable/connector is an odd choice. Especially when performance is seriously degraded without a high-powered and voltage-controlled source. Am I missing something? Why is this a good idea?
    My guess is that this way Xtar can be sure you are using a good cable between the charger and the usb power supply and not a cheap thin usb cable.
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    Default Re: Test/Review of Charger Xtar VC4

    very good rev HKJ
    It is confirmed that this charger require a 'strong' USB power-source for doing the best work.

  6. #6
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    Default Re: Test/Review of Charger Xtar VC4

    Great review, the new display is pretty cool looking.

  7. #7

    Default Re: Test/Review of Charger Xtar VC4

    • With only slot #1 and #4 in use maximum charger current is 1A
    • With slot #2 or #3 in use all slots are limited to 0.5A charge current.


    Is that something you discovered, or is it stated in the manual & marked on the charger? Seems odd that using ONLY the center slots limits the current.

  8. #8
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    Default Re: Test/Review of Charger Xtar VC4

    Quote Originally Posted by lumen aeternum View Post
    • With only slot #1 and #4 in use maximum charger current is 1A
    • With slot #2 or #3 in use all slots are limited to 0.5A charge current.


    Is that something you discovered, or is it stated in the manual & marked on the charger? Seems odd that using ONLY the center slots limits the current.
    It is marked on the charger, stated in the manual and shows up in my test (It is not the first Xtar charger that works this way).
    Look closely at the bottom of on this picture:
    My website with battery, charger, usb reviews, comparisons & information: https://lygte-info.dk/
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  9. #9

    Default Re: Test/Review of Charger Xtar VC4

    HKJ,

    Thanks for the review, very nice and informative as usual.

    Now as far as NIMH is concerned which one does a better a job charging them?
    This Xtar or the Opus 3100?

    Or it doesnt matter they are both as good as it gets?

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    Default Re: Test/Review of Charger Xtar VC4

    Quote Originally Posted by hammerjoe View Post
    Now as far as NIMH is concerned which one does a better a job charging them?
    This Xtar or the Opus 3100?

    Or it doesnt matter they are both as good as it gets?
    Mostly they are the same, but I would expect the Opus to be slightly better at getting all batteries full and the Xtar may be slightly better with old batteries.
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    Default Re: Test/Review of Charger Xtar VC4

    deleted
    Last edited by SubLGT; 04-11-2015 at 10:59 AM.

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    Default Re: Test/Review of Charger Xtar VC4

    Quote Originally Posted by SubLGT View Post
    Is there a technical challenge that is stopping Xtar from manufacturing a 4 channel charger that can charge at 1A in all 4 channels simultaneously ?
    You cannot do it on usb power, but with a 12V charger it is easy enough to do, but heat is difficult to manage.
    When you check my reviews of compact 4 channel chargers they are always rather warm when charging or has a fan.
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    Default Re: Test/Review of Charger Xtar VC4

    HKJ, you are quick! I deleted my question after seeing that Xtar does indeed manufacture a 4 channel charger that can charge at 4 x 1A. The XP4 Panzer.

    You reviewed it a few years ago: http://www.candlepowerforums.com/vb/...=test+xtar+xp4


    • "The charger gets hot while working at maximum current, the battery temperature is just at the allowable limit. I would have preferred both the box and the batteries where considerable cooler, this heat does wear the batteries down faster………….."
    Last edited by SubLGT; 04-11-2015 at 11:13 AM.

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    Default Re: Test/Review of Charger Xtar VC4

    Quote Originally Posted by SubLGT View Post
    HKJ, you are quick!
    When I am working at the computer I will often answer immediately.
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    Default Re: Test/Review of Charger Xtar VC4

    Quote Originally Posted by thedoc007 View Post
    I'm a little mystified...a USB-powered charger that doesn't use a standard USB cable/connector is an odd choice. Especially when performance is seriously degraded without a high-powered and voltage-controlled source. Am I missing something? Why is this a good idea?
    Because micro USB is limited to 1.8A and this charger needs more than that to run at full power.

    The logical step would be the DC 5.5x2.1mm plug but they already use that size for their 12V adapters, so for safety reasons Xtar went with the 5.5x2.5mm plug, both are very common plug sizes with a plethora of adapters, extension cables, chargers, etc out there on eBay.

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    Default Re: Test/Review of Charger Xtar VC4

    As always your time and effort in your fastidious reviews are highly appreciated HKJ

    This charger will soon be a "works" charger,2 reasons other than its Xtar and good,1- i dont need more than 2 x18650 at a time charged in work(sr51 as one example) 2- It is good at NiMH ,so my e25 burst 2xAA and T7.2 2xAAA all eneloops fed will be very happy

    I await a vc6 which "may" give an option of 4 of the 6 bays a 1a charge rate..........that i would buy for home use(of course i would prefer 6x1a rate,but realistic due to heat and size). I just want a good charger that can handle 4x1a rates and by Xtar.

    Thanks ven

  17. #17

    Default Re: Test/Review of Charger Xtar VC4

    I have this charger and like it for what it is. However, I felt a little mislead by the USB power. I thought I would be able to travel with less cables, but alas I HAVE to bring this extra cable along. Almost making the fact that it is USB pointless.

    On the other hand, it is a good point, the lower input does make it a little more idiot proof.




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    Default Re: Test/Review of Charger Xtar VC4

    Quote Originally Posted by Berneck1 View Post
    However, I felt a little mislead by the USB power. I thought I would be able to travel with less cables, but alas I HAVE to bring this extra cable along. Almost making the fact that it is USB pointless.
    But you might be able to travel with a power supply less, that is considerable larger than a usb cable.
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  19. #19

    Default Re: Test/Review of Charger Xtar VC4

    Quote Originally Posted by HKJ View Post
    But you might be able to travel with a power supply less, that is considerable larger than a usb cable.
    True, every little bit helps I guess...


    Sent from my iPad using Candlepowerforums

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    Default Re: Test/Review of Charger Xtar VC4

    Quote Originally Posted by Berneck1 View Post
    I have this charger and like it for what it is. However, I felt a little mislead by the USB power. I thought I would be able to travel with less cables, but alas I HAVE to bring this extra cable along. Almost making the fact that it is USB pointless.
    Not really. The fact that it is USB also makes it easily usable with such things as USB solar panels and USB car chargers.

  21. #21

    Default Re: Test/Review of Charger Xtar VC4

    Thank you for another fantastic review HKJ! I have the XTAR VP1 now (which I only bought after seeing that you gave it a thumbs up). I've since got into vaping and have tossed around the idea of getting some 26650s (which the VP1 doesn't do). Also, more charging slots = better.

    2 things I love about the VP1 that I don't want to lose.
    1 - 0.25A charging capability. Can you tell the VC4 to stay at 0.25A max?
    2 - Voltage readout to the hundredth of a volt. It looks like the VC4 never shows a numeric voltage readout, is that correct? It's just on the gauge. My only reason for wanting a precise voltage readout is 2 pairs of batteries that I have married for series use. I guess having the mAh readout is as good or better for seeing how close 2 batteries are in performance?

    Maybe I am really looking for a VP4 instead of the VC4? Thanks in advance for any advice you have!

  22. #22
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    Default Re: Test/Review of Charger Xtar VC4

    VP 4 already out I think.

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    Default Re: Test/Review of Charger Xtar VC4

    One on its way will be my 4th Xtar charger and with good reason. Will be a works charger ,need one for 18650 and eneloops in one.

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    Default Re: Test/Review of Charger Xtar VC4

    Thank you for your excellent review. HKJ!
    It seems that the VC4 has feature of the VP4 plus Ni-MH charging.

  25. #25
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    Default Re: Test/Review of Charger Xtar VC4

    VC4 came today to add to my xtar chargers,initial impressions are great,love the carry bag............great idea,even if used to protect/cover/store as well as obviously travel.
    Display is nice and bright,simple button press to change ch1+4 or ch 2+3 read out. Think i would prefer all to be shown but (or fitted in display) tbh ,but no deal killer. Certainly a nice solid/substantial feel to the plastic over some chargers like the i4 and wp6II.

    Gripe,yes one that bothers me a little,i would have preferred the actual plug to be universal when fitted in charger port(not usb end thats a great idea) plug end........ Maybe an actual Xtar USB plug thrown in..........just a thought and i may be alone on that I have lots of USB plugs,would just prefer to use an Xtar branded one over say an apple or alike.........

    Yes working hands (they do get washed honest)........... dry skin and being an engineer=

    Plug differences with vp1 charger


    As i will not be using it direct into say laptop(usb is great for flexibility ,so dont get me wrong here) i would have liked it to be universal,so use of the vp1 or vp2 chargers leads as examples.......again personal gripe and i know its designed around travel/usb use..........just would have been nice for it to work off Xtar adapters for added flexibility(or again throw in a usb plug)

    Norb sent me a couple of free 14500 cells,dont know if good........will check up but grateful all the same






    Its kind of in the middle right now...........




    My decider on this charger thanks to HKJ,was the Ni-MH support,will be great in work for my eneloops and my 18650 cells of course.

    Sure the display will "grow" on me,just prefer actual digital V read out (4.16 for example) over a needle/gauge........just user friendlier imo anyway. Something i no doubt will get used to over time. The mah will be useful,but again,will show from where the V is to start from,most my cells are 3.8v in lights,ecig mods...........well some 3.6v,.the vaporshark rDNA40 will run to 3.3v so that should give a better indication to the cells mah(IMR and INR only for those uses).

    Time will tell and admit Xtar is my fav brand of chargers,this certainly has a "quality" feel to it,thanks again HKJ

    Cheers ven
    Last edited by ven; 04-17-2015 at 04:56 AM. Reason: obviously critiquing once before posting is never enough

  26. #26
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    Default Re: Test/Review of Charger Xtar VC4

    Quote Originally Posted by ven View Post
    Gripe,yes one that bothers me a little,i would have preferred the actual plug to be universal when fitted in charger port(not usb end thats a great idea) plug end........ Maybe an actual Xtar USB plug thrown in..........just a thought and i may be alone on that I have lots of USB plugs,would just prefer to use an Xtar branded one over say an apple or alike.........
    The problem is that a 12V power supply probably will blow the VC4, i.e. I see it as an advantage that it uses a different plug.
    I would have liked it even better if it could work on both 5V and 12V, then there would be no problem with using the same plug as other Xtar chargers.
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    Default Re: Test/Review of Charger Xtar VC4

    Quick question just to make sure(i have already done it issue free but want to know long term) Am i OK using an apple USB plug or any other specific plug over this for plugging in the wall(or am i best not to plug into the wall via USB).

    Many thanks ven

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    Default Re: Test/Review of Charger Xtar VC4

    Quote Originally Posted by ven View Post
    Quick question just to make sure(i have already done it issue free but want to know long term) Am i OK using an apple USB plug or any other specific plug over this for plugging in the wall(or am i best not to plug into the wall via USB).
    I suppose you mean using a Apple usb power supply and that is fine, the problem is all the cheap Chinese ones.
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    Default Re: Test/Review of Charger Xtar VC4

    Quote Originally Posted by HKJ View Post
    I suppose you mean using a Apple usb power supply and that is fine, the problem is all the cheap Chinese ones.
    Yes,sorry,to clarify the actual USB power supply/plug.

    Cheers ven

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    Default Re: Test/Review of Charger Xtar VC4

    Quote Originally Posted by ven View Post
    Yes,sorry,to clarify the actual USB power supply/plug.
    The 12W Apple charger is very good, I have just published a review of it.
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