Test/review of Zanflare C4

84 posts / 0 new
Last post

Pages

HKJ
HKJ's picture
Offline
Last seen: 38 min 30 sec ago
Joined: 05/24/2011 - 12:23
Posts: 6327
Location: Copenhagen, Denmark
Test/review of Zanflare C4

Zanflare C4

DSC_0481

DSC_0482DSC_0483

Zanflare is a new name in chargers and starts with an analyzing charger. It can handle LiIon and NiMH at a few different currents. The user interface is very simple and easy.

DSC_0372 DSC_0373

It arrived in a cardboard box with and image of the charger and not much more.

DSC_0477

The box included the charger, a mains adapter, a car adapter and the instruction sheet.

DSC_0484

The charger has a 12V input and a usb output connection, on the bottom of the charger it says the usb output is rated at 2A.

DSC_0486

The user interface is a lcd display and 6 buttons.
The 4 round buttons select display for that slot (mA, Volt, mAh, mR(Internal resistance), Time)
The MODE button select between charge, fast test and NOR test.
The CURRENT button select the charger or discharge current depending on mode.

DSC_0586
DSC_0587

The display is simple and easy to read.

DSC_0485

As usual there are specifications on the bottom, but they are not easy to read.

DSC_0487DSC_0488

The slots uses the classical slider construction and it works fine.
The slots can work from 30.7 mm to 70.3mm. This means that it will not handle the longest 18650 and 26650

supportedBatteryTypes

supportedBatterySizesDSC_0553DSC_0554DSC_0555

DSC_0556DSC_0557DSC_0558DSC_0559DSC_0560DSC_0562DSC_0561

The charger can handle 70 mm long batteries including flat top cells.



Measurements


  • Discharge LiIon battery with 10mA when not connected to power.
  • When power is connected with a full battery, it will charge with about 1mA.
  • Between 0.0V and 2.1V the charger will assume NiMH
  • Above 2.1V the charger will assume LiIon.
  • Minimum voltage reading is about 0.79V
  • Voltmeter is within 0.02V
  • Voltmeter stops updating when charging is stopped
  • Charger will not restart when voltage drops.
  • It will restart charging on reinsertion of the battery or power cycling.
  • Power consumptions when idle without battery is 0.4 watt


Charging LiIon

It is possible to select 300, 500, 700 and 1A in charge current.

Zanflare%20C4%201A%20%28SA18650-33%29%20%231

A nice CC/CV charge curve with termination around 200mA. It is probably a simulated CC/CV curve, i.e. the termination current will vary depending on cell.
Display shows 3263mAh 90mOhm 4:02 hours

Zanflare%20C4%201A%20%28SA18650-33%29%20%232
Zanflare%20C4%201A%20%28SA18650-33%29%20%233
Zanflare%20C4%201A%20%28SA18650-33%29%20%234

The other channels works the same way.
Display shows 3328mAh 300mOhm 4:19 hours, 3352mAh 364mOhm 4:22 hours, 3327mAh 168mOhm 4:06 hours

Zanflare%20C4%201A%20%28SA18650-26%29%20%231
Zanflare%20C4%201A%20%28PA18650-31%29%20%231

The two other cells also charge as expected.

Zanflare%20C4%201A%20%28BE18650-26%29%20%231

The old cell is handled very nicely.
Display shows 2316mAh 296mOhm 3:56 hours

Zanflare%20C4%200.3A%20%28SA18650-33%29%20%231

Zanflare%20C4%200.7A%20%28SA18650-33%29%20%231

Both 300mA and 700mA looks fine.
Display shows 3419mAh 208mOhm 13:18 hours, 3293mAh 108mOhm 5:29 hours

Zanflare%20C4%200.5A%20%28AW18350-IMR%29%20%231

The charger stops a bit early with this old worn down cell.
Display shows 258mAh 494mOhm 0:50 hours

Zanflare%20C4%200.5A%20%28KP14500-08%29%20%231

No problem with this cell.
Display shows 777mAh 288mOhm 1:57 hours

Zanflare%20C4%201A%20%284xSA18650-33%29

No problem charger 4 cells simultaneous.

Zanflare%20C4%201A%2012V%20%28SA18650-33%29

Or is there, the power supply is rated for 1.5A, but the charger uses 1.7A. Obvious it works fine enough, but the power supply is at the limit for a short time during a charge.

Temp4383

M1: 36,5°C, M2: 38,7°C, M3: 39,2°C, M4: 37,3°C, M5: 39,6°C, M6: 43,3°C, HS1: 53,7°C

Temp4384
M1: 35,3°C, HS1: 43,1°C

PoweronLiIon

The charger always do a internal resistance check when a battery is put into a slot or when powered on with a battery in it.
When no buttons are pressed it will start charging at 0.5A after about 9 seconds.

Charge1ALiIon

During charge there are pauses to measure voltage.



Fast test of LiIon

It is possible to select 300 or 500mA discharge and charge current.

Zanflare%20C4%20fast%200.5A%20%28SA18650-33%29%20%234

The charge will discharge the battery and then measure how much current is needed to full charge the battery.
Display shows 3379mAh 180mOhm 14:50 hours



NOR test of LiIon

It is possible to select 300 or 500mA discharge and charge current.

Zanflare%20C4%20NOR%200.5A%20%28SA18650-33%29%20%231

The charge will first charge the battery, then discharge while measuring capacity and finally charge again.
It discharges to about 2.8V with constant current, i.e. no pwm.
Display shows 3369mAh 288mOhm 21:51 hours

Zanflare%20C4%20NOR%200.5A%20%28SA18650-33%29%20%232
Zanflare%20C4%20NOR%200.5A%20%28SA18650-33%29%20%233
Zanflare%20C4%20NOR%200.5A%20%28SA18650-33%29%20%234

The other channels looks the same.
Display shows 3537mAh 202mOhm 22:41 hours, 3335mAh 120mOhm 21:26 hours, 3403mAh 216mOhm 22:13 hours

Zanflare%20C4%20NOR%200.3A%20%28SA18650-33%29%20%231

The 300mA setting will reduce both charge and discharge current.
Display shows 3374mAh 572mOhm 37:38 hours

Zanflare%20C4%20NOR%200.5A%20%284xSA18650-33%29

With 4 batteries the temperature will increase when discharging.

Temp4392

M1: 40,4, M2: 41,2, M3: 41,3, M4: 39,8, M5: 61,7, M6: 55,0, HS1: 65,3

Temp4393

M1: 43,6, HS1: 61,2



Measuring internal resistance of LiIon

IRLiIon

The internal resistance measurement looks very stable in values and fairly precise. The resolution looks to be 2mOhm



Charging NiMH

It is possible to select 300, 500, 700 and 1000mA charge current.

Zanflare%20C4%201A%20%28eneloop%29%20%231

With NiMH the charger will terminate on voltage or -dv/dt as can be seen on some of the other curves.
The termination is just about where the battery start developing heat.
Display shows 1904mAh 108mOhm 2:03 hours

Zanflare%20C4%201A%20%28eneloop%29%20%232
Zanflare%20C4%201A%20%28eneloop%29%20%233
Zanflare%20C4%201A%20%28eneloop%29%20%234

The other 3 channels looks the same.
Display shows 1930mAh 284mOhm 2:03 hours, 1852mAh 180mOhm 2:00 hours, 1847mAh 136mOhm 1:59 hours

Zanflare%20C4%201A%20%28eneloopPro%29%20%231

With the pro cell it uses -dv/dt termination.
Display shows 2761mAh 174mOhm 2:59 hours

Zanflare%20C4%201A%20%28eneloopXX%29%20%231

This cell is old and worn down, but it do a very fine job on charging it.
Display shows 1229mAh 316mOhm 2:26 hours

Zanflare%20C4%201A%20%28powerex%29%20%231

This is also a good charge.
Display shows 2830mAh 566mOhm 0:04 hours

Zanflare%20C4%200.3A%20%28eneloop%29%20%231

Even at 0.3A it can terminate a NiMH charge, it may use 0dv/dt termination for this.
Display shows 1982mAh 154mOhm 7:24 hours

Zanflare%20C4%200.7A%20%28eneloop%29%20%231

No problems at 0.7A
Display shows 1901mAh 210mOhm 2:52 hours

Zanflare%20C4%200.5A%20%28eneloopAAA%29%20%231

The AAA cell is charged fine at 0.5A
Display shows 808mAh 400mOhm 1:45 hours

Zanflare%20C4%201A%20full%20%28eneloop%29%20%231

It is fast to detect a full cell, it only requires 5 minutes.
Display shows 31mAh 210mOhm 0:04 hours

Zanflare%20C4%201A%20%284xeneloop%29%20%231

The charge maintain full charge speed with 4 NiMH cells.
Display shows 2025mAh 150mOhm 2:10 hours, 2163mAh 106mOhm 2:20 hours, 2118mAh 96mOhm 2:17 hours, 2108mAh 88mOhm 2:17 hours

Zanflare%20C4%201A%20%284xeneloop%29

It needs about 0.9A from the power supply.

Temp4400

M1: 38,1°C, M2: 40,6°C, M3: 40,3°C, M4: 38,6°C, M5: 43,8°C, M6: 39,1°C, HS1: 53,2°C

Temp4400

M1: 36,0°C, HS1: 44,9°C

PoweronNiMH

When the charger see a battery it will measure its internal resistance.
It will automatic start charging a NiMH cell about 10 seconds after power is applied. The default current is 0.5A.

Charge1ANiMH

The charger will pause at regular intervals to measure the voltage.



Fast test of NiMH

It is possible to select 300 or 500mA discharge and charge current.

Zanflare%20C4%20fast%200.5A%20%28eneloop%29%20%231

With the fast test it will discharge the battery and then charge it while measuring the charged capacity.
Display shows 2054mAh 82mOhm 8:16 hours



NOR test of NiMH

It is possible to select 300 or 500mA discharge and charge current.

Zanflare%20C4%20NOR%200.5A%20%28eneloop%29%20%231

The normal test will first charge the battery, then discharge it while measuring capacity and finally charge it again.
The battery is discharged to about 1.05V
Display shows 2006mAh 330mOhm 12:16 hours

Zanflare%20C4%20NOR%200.5A%20%28eneloop%29%20%232
Zanflare%20C4%20NOR%200.5A%20%28eneloop%29%20%233
Zanflare%20C4%20NOR%200.5A%20%28eneloop%29%20%234

The other 3 slots looks the same.
Display shows 1984mAh 188mOhm 12:34 hours, 2023mAh 160mOhm 12:42 hours, 1988mAh 174mOhm 12:24 hours

Zanflare%20C4%20NOR%200.3A%20%28eneloop%29%20%231

The 0.3A setting will reduce both charge and discharge current.
Display shows 2077mAh 138mOhm 22:43 hours

Zanflare%20C4%20NOR%200.5A%20%284xeneloop%29

With 4 cells there is not much heat during discharge.

Temp4408

M1: 35,4°C, M2: 37,0°C, M3: 36,6°C, M4: 35,5°C, M5: 39,9°C, M6: 38,5°C, HS1: 45,1°C

Temp4409

HS1: 41,3°C

DischargeNiMH

The discharge is with constant current, this curve is rather boring.



Measuring internal resistance of NiMH

IRNiMH

The NiMH internal resistance is also very stable and fairly good.



Power bank function

  • USB output is coded as usb charger (DCP).
  • USB output is turned when loaded, it cannot be turned on with a button press.
  • USB output will turn off 5 seconds after load is dropped below about 60mA.
  • USB output is turned off when charger is powered
  • Discharge LiIon battery with 10mA when not connected to power (Not very good).
  • When battery is down to 2V it will discharge with 7.5mA (Bad).


Zanflare%20C4%20%28SA18650-33%29%20%231%20load%20sweep

The usb output can deliver the rated 2A, but not much more. The output is slightly low at 2A.

Zanflare%20C4%20%282xSA18650-33%29%20load%20sweep

More batteries in the charger do not change the output limit.

Zanflare%20C4%20usb%20out%2010ohm%20%28SA18650-33%29%20%231

The output voltage is stable at 0.5A and with one battery I got about 4 hours. When the battery is empty the output turns off, but it do not remove all load from the battery, the above recording stopped at 2.4V, but a couple of hours later the battery was down to 2.2xV.

Zanflare%20C4%20usb%20out%205ohm%20%28SA18650-33%29%20%231

One cell did also handle 1A output fine.

Zanflare%20C4%20usb%20out%202.5ohm%20%284xSA18650-33%29

At 2A with 4 cells the output was maintained for about 4 hours.

10ohm

At 0.5A the noise is 5mV rms and 62Vpp

5ohm

At about 1A the noise is 28mV rms and 134Vpp

2.5ohm

At about 2A the noise is 28mV rms and 144mVpp, this is very good.

USB%20battery%20drain

I decided to take a closer look at the battery drain with unloaded usb output. As can be seen the drain goes low at about 1.7V, this is rather low for a LiIon battery.
With the curve I started from 4.25V and over 20 minutes I slowly reduced the voltage.


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



Conclusion

The charger does a good job charging both LiIon and NiMH. I like that the test function uses a constant current and the IR function works fine. The mAh display is a bit on the high side.

The usb output can deliver the rated 2A, but it is slightly low in voltage and will discharge battery to a rather low voltage if they are left in the charger.

Generally the charger will drain batteries when it is unpowered, i.e. do never leave batteries in it.

As a charger and analyzer it is good, the usb output works fine, but it discharges batteries too much when used as power bank.



Notes

The charger was supplied by a Gearbest.com 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/

Edited by: HKJ on 08/28/2017 - 11:00
giorgoskok
giorgoskok's picture
Offline
Last seen: 14 hours 55 min ago
Joined: 11/13/2015 - 10:46
Posts: 2658
Location: Greece

I think it’s a good charger , i have been using it and testing it for about a month , measurements are pretty close to my Opus bt-c3100 .

L4M4
L4M4's picture
Offline
Last seen: 10 hours 4 min ago
Joined: 12/08/2013 - 13:43
Posts: 1236
Location: Germany

To me, this thing looks like a Lii-500 with a different Firmware.
I don’t see why this thing is 3 times as expensive as the Lii-500.

Trevi_lux
Trevi_lux's picture
Offline
Last seen: 8 hours 28 min ago
Joined: 09/04/2012 - 10:52
Posts: 2296
Location: Spain

Thanks for review, I use it from some weeks ago, but I feel more secure after reading HKJ reviews.!

L4M4 wrote:
To me, this thing looks like a Lii-500 with a different Firmware. I don’t see why this thing is 3 times as expensive as the Lii-500.
Hi L4M4: This charger that include charge EU/US plug and charger 9V for car, is for 27,99 USD for sale….I do not think this is 3 times more expensive than Lii-500…..
L4M4
L4M4's picture
Offline
Last seen: 10 hours 4 min ago
Joined: 12/08/2013 - 13:43
Posts: 1236
Location: Germany

Lii-500 also has a car charger and charger for EU or US. I just looked at the price in the Zenflare Shop (48$)
Lii-500 with code is <20$
Just sayin’ Big Smile

Trevi_lux
Trevi_lux's picture
Offline
Last seen: 8 hours 28 min ago
Joined: 09/04/2012 - 10:52
Posts: 2296
Location: Spain
L4M4 wrote:
Lii-500 also has a car charger and charger for EU or US. I just looked at the price in the Zenflare Shop (48$) Lii-500 with code is

I have seen the Lii-500 at 30 USD in Tmart…but I do not think that the price of Lii-500 is 30 USD…. I know there are other prices, other sites…. than _Zenflare shop.
Reading complete review of this and of Lii-500, the Zanflare seems better with “resistance function”, one of my preferences for this. Without coupon the C4 is now in 27,99 USD.
Both seem a good option, perhaps for resistance reading better the zanflare and perhaps for charge at 2 Amp. (power bank function) better the Zanflare, …If I read more in depth maybe I will find some further advantage ….
I do not say that the Lii-500 is not a good charger, I do not pretend that. please, no one misunderstand me)

SoCalTiger
SoCalTiger's picture
Offline
Last seen: 6 days 13 hours ago
Joined: 03/16/2017 - 14:06
Posts: 417
Location: Southern California

Thanks for the review. I’ve also been using mine for about a month and love it.

stephenk
stephenk's picture
Offline
Last seen: 20 hours 46 min ago
Joined: 01/30/2016 - 05:09
Posts: 1296
Location: Australia

Good to see another option in the analysing charger market.

flydiver
Offline
Last seen: 48 min 56 sec ago
Joined: 06/19/2013 - 19:16
Posts: 831
Location: Seattle, WA

The C4 is showing up regularly at $24, putting it pretty much in the same price range as a complete Lii-500. It works almost identically. Got mine and been cycling/charging cells for a couple days now. Seems reliable, generally runs pretty cool, not having any problems with an assortment of battery chemistries of various ages.

One thing I REALLY like is the [Internal Resistance] DOES WORK! It is ‘stable’ and seems reliable. It tracks pretty close to the IR I get off my Opus. The IR with the Lii-500 is useless, and I’ve tried 3 different units so I know it’s not just a problem with a single charger.

As far as I’m concerned this charger could completely displace the Lii-500 as a bargain analyzing charger, and do it one better with working IR.

SoCalTiger
SoCalTiger's picture
Offline
Last seen: 6 days 13 hours ago
Joined: 03/16/2017 - 14:06
Posts: 417
Location: Southern California

Yes and the C4 comes with a working power adapter so that needs to be considered in the cost equation as well. They are effectively the same price when you consider that unless you happen to already have a compatible adapter.

Pete7874
Pete7874's picture
Offline
Last seen: 3 hours 5 min ago
Joined: 11/23/2011 - 16:47
Posts: 1972
Location: USA

SoCalTiger wrote:
Yes and the C4 comes with a working power adapter so that needs to be considered in the cost equation as well.

I’m pretty sure that’s what flydiver meant when he wrote “a complete Lii500.” Smile
flydiver
Offline
Last seen: 48 min 56 sec ago
Joined: 06/19/2013 - 19:16
Posts: 831
Location: Seattle, WA

Yes, this being BLF people get all excited when they see a Lii-500 for $13-15, and want to know HOW they can get that price.
1. That is a bare charger, nothing else. So you’ll have to hassle with a decent power supply, and car charger if you care about that.
2. You are likely dealing with Ali express, which can be it’s own pain depending on where you live. Sad
3. You rarely see a complete Lii-500 for less than $20. $25-30 is not unusual for more accessible, faster, and more reliable shipping sources, depending on location.

From my perspective $24 for the Zanflare C4 is an easy choice. I consider IR to be an important piece of information on battery health and it’s just not available on the Lii-500.

Trevi_lux
Trevi_lux's picture
Offline
Last seen: 8 hours 28 min ago
Joined: 09/04/2012 - 10:52
Posts: 2296
Location: Spain

I use from two month ago as principal charger the C4 and runs fine. I am happy. (For the price, perhaps the best option now. )

MRsDNF
MRsDNF's picture
Offline
Last seen: 1 hour 25 min ago
Joined: 12/22/2011 - 21:18
Posts: 12489
Location: A light beam away from the missus in the land of Aus.

From the comments it sounds like this charger is becoming a favourite. I hope Gearbest decide to bring this out with an Australian plug so we dont have to use sub standard adaptors.

My current and or voltage measurements are only relevent to anything that I measure.

Budget light hobby proudly sponsored by my Mastercard and unknowingly paid for by a hard working wife. 

djozz said "it came with chinese lettering that is chinese to me".

old4570 said "I'm not an expert , so don't suffer from any such technical restrictions".

Old-Lumens. Highly admired and cherished member of Budget Light Forum. 11.5.2011 - 20.12.16. RIP.

 

MAD777
MAD777's picture
Offline
Last seen: 2 months 3 weeks ago
Joined: 04/21/2016 - 12:13
Posts: 108
Location: Florida

I bought this charger based on HKJ’s review. Particularly it’s ability to measure internal resistance with some accuracy.
I’ve now put it through the paces and like it very much as a straight forward, simple to use charger.
As to measuring internal resistance, I’ve tested banks of batteries by loading them multiple times in the same bays and then through rotating through all bays and recording the results. My unit measures IR consistently within a range of 6 mOhms, which is plenty good enough for my purposes.

Mike

stephenk
stephenk's picture
Offline
Last seen: 20 hours 46 min ago
Joined: 01/30/2016 - 05:09
Posts: 1296
Location: Australia

MRsDNF wrote:
From the comments it sounds like this charger is becoming a favourite. I hope Gearbest decide to bring this out with an Australian plug so we dont have to use sub standard adaptors.

+1, all of my chargers have to use US or EU to AU adapters.
nquinn
Offline
Last seen: 2 weeks 1 day ago
Joined: 09/11/2017 - 21:55
Posts: 218
Location: DC

Can anyone confirm if the Zanflare C4 can charge 18350 batteries? Most sites don’t list it in the description.

Box
Offline
Last seen: 2 months 3 weeks ago
Joined: 08/26/2014 - 06:53
Posts: 635
Location: Australia

Yes it can charge 18350 Thumbs Up

ferongr
ferongr's picture
Offline
Last seen: 5 months 1 week ago
Joined: 04/11/2015 - 07:15
Posts: 142
Location: Athens

Ordered one from GB for 23$. The fact that the display shows all slots at the same time and the working analyzing functions, in addition to good NiMH charging makes it an ideal replacement for my Lii-400, that I’m going to give to my father.

DEL
DEL's picture
Offline
Last seen: 8 months 3 weeks ago
Joined: 06/28/2015 - 08:35
Posts: 559
Location: Canada

I am using 2 of these and have a 3rd spare (they were cheap!). Thought I should probably do a test run on the spare, and just as well: Channel 1 turned out to be dead.

4 screws below the rubber feet, so easy to open…wrong. This thing is glued shut pretty well. Finally had to punch through the glued seam with a sharpened flat-blade screwdriver and work it open from there.

Problem turned out to be the soldering for the cell+ contact plate, there was none!

Could not find any online photos of the insides, so below are some for reference. Looks decent, but the hand-soldering quality (needed for awkward components) is mediocre at best. 2 or 3 production ‘patches’ are also visible. The culprit contact plate had a bent leg, so could not insert properly into the PCB.

Separating the PCB required the springs to be de-soldered. And it is tricky to put back together, so not recommended to do this unless really necessary. Ended up with some cosmetic damage along the seam, but it is still usable (and now also serviceable).

  • No solder on those two slots bottom right:

  • Springs de-soldered:

  • UI control board, unplugged:


  • Culprit:

  • Power circuit. Four TO-220 N-channel MOSFETs, probably used as active loads for the discharge tests. Two incognito controller chips:


  • Ugly patch from 3rd inductor to sense resistor:

  • 5 V output boost circuit:

  • Floating diode patch:

Agro
Online
Last seen: 12 sec ago
Joined: 05/14/2017 - 11:16
Posts: 2935
Location: Ślōnsk

My C4 normal test results are very volatile.
I tested one 35E at 3539 mAh. Couldn’t believe I was so lucky, re-tested. 3418 mAh.
Another was lower than expected, 3350 re-test OK, 3364.
A third cell that I tested twice, 18650B, a bit used, 3529 on the first test, 3438 on the next.

Also, resistance numbers are very different from one insertion to another. I can get 20 or 60 mOhm. It doesn’t depend on which slot do I insert battery to in an obvious way.

Any idea why is it so?
It’s my first analyzing charger and I don’t really know what to expect. Is it OK? Should I RMA? Something in between?

ferongr
ferongr's picture
Offline
Last seen: 5 months 1 week ago
Joined: 04/11/2015 - 07:15
Posts: 142
Location: Athens

You should RMA it, my C4 is very consistent down to less than 10mAh. Even internal resistance is consistent within 5 “mR” between reinsertions.

Barkuti
Barkuti's picture
Offline
Last seen: 3 hours 50 sec ago
Joined: 02/19/2014 - 14:46
Posts: 3034
Location: Alhama de Murcia, Spain

Fellows I do not mean to be a wet blanket but bear in mind the fact that whatever cell to be internal resistance measured in the charger needs two physical connections to it, two contact resistances whose magnitude against the internal resistance of a typical cell is considerable. There's no real “fix” other than soldering or spot-welding the cells to the rail feeding contacts for this to be dismissed. 

 

Cheers Smile

ferongr
ferongr's picture
Offline
Last seen: 5 months 1 week ago
Joined: 04/11/2015 - 07:15
Posts: 142
Location: Athens

For 500mA discharge current it shouldn’t matter, the connection resistance generates negligible amounts of voltage drop at this current. 100mAh discrepancies on the discharge test are a fault and not a design issue. While 4 contacts are ideal for IR measurement, this should have no bearing on the issue the previous poster encounters, that is, completely inconsistent capacity measurements and IR readings. My own C4 operates to spec and Henrik’s review shows that IR measurement is consistent between reinsertions.

Barkuti
Barkuti's picture
Offline
Last seen: 3 hours 50 sec ago
Joined: 02/19/2014 - 14:46
Posts: 3034
Location: Alhama de Murcia, Spain

ferongr, I was not particularly referring to Agro's  issue. I just wanted to point out that rail to cell contact resistances are in the same order of magnitude to that of the cell's internal resistance and, at the same time, they're not constant and predictable. To me this means that in order to get some meaningful data we should at least gather a set of measurements to average for each cell and make sure the cell's well seated for each measurement. Just in my opinion, of course.

 

Cheers fellows Smile

ferongr
ferongr's picture
Offline
Last seen: 5 months 1 week ago
Joined: 04/11/2015 - 07:15
Posts: 142
Location: Athens

The Zanflare C4 does a lot better than expected. Even with my 20A+ cells (LG HB6) with very low internal resistance I’m getting stable and consistent readings. While the reading will obviously be offset due to the rail and contact resistance, if those two remain constant then you get usable and consistent results.

(Chart from HJK’s review )

Note that the multiple tests on all slots remain consistent, and increasing resistance also increases the reading consistently. This is a lot better than other analyzing chargers, a very usable result to see the condition of a cell and also a lot better compared to many other chargers.

vulpes
vulpes's picture
Offline
Last seen: 2 days 10 hours ago
Joined: 08/20/2015 - 17:15
Posts: 275
Location: Bosnia and Herzegovina

Does anyone have any codes for this? Those that I could find ($19 on GB) are long dead.

kuoh
Offline
Last seen: 3 hours 45 min ago
Joined: 03/10/2013 - 12:42
Posts: 504
While you may have received a very good sample or are extremely consistent with cell placement, I think it’s a bit much to expect that level of precision given the price point. Even a 100mah difference in capacity is only around 3% to 5% variation for a 3000+ mAh cell which I think is pretty darn good and consistent with other analyzers in the same price range.

KuoH

ferongr wrote:
You should RMA it, my C4 is very consistent down to less than 10mAh.
ferongr
ferongr's picture
Offline
Last seen: 5 months 1 week ago
Joined: 04/11/2015 - 07:15
Posts: 142
Location: Athens

If the capacity measurement changed significantly between reinsertions, the loss on the contacts would be so great that would lead to localized heating. It would also lead to incorrect charging voltage, since the voltage drop would affect the CV phase. The issue with reinserstion in most 2 contact analyzers is with internal resistance measurements.

FWIW the $8 Opus BT-C100 I have is similarly consistent in current measurements (not in IR though). Since I also mostly charge pairs of married cells of 18650s from my electronic cigarettes, if inconsistent contact affected capacity measurements it would show. Since both cells are within 15mAh though, it appears you are incorrect.

kuoh
Offline
Last seen: 3 hours 45 min ago
Joined: 03/10/2013 - 12:42
Posts: 504
For 100mah over a period of hours to perform testing, localized heating at the contacts would not be very significant. As for your measurements always being within 10’s of mAh, good for you. However if we all expected this level of precision and returned all units not meeting this criteria, there would be few analyzer chargers in the $10-$25 range like we see today.

I also have a c100, 2x c3100, 2x li 500, Zansflare c4 and a few others I can’t remember right now. Yes occasionally I can get readings that are quite close, but I’m not expecting 0.2% precision. Don’t get me wrong, I don’t mind if it’s better and certainly don’t want it to be 10% off, but I understand consumer level products are designed to certain price points and set my expectations accordingly.

KuoH

ferongr wrote:
If the capacity measurement changed significantly between reinsertions, the loss on the contacts would be so great that would lead to localized heating.
ferongr
ferongr's picture
Offline
Last seen: 5 months 1 week ago
Joined: 04/11/2015 - 07:15
Posts: 142
Location: Athens

I charge a pair of batteries every day. If there was that much of a difference between capacity merasurements every time it would be obvious. I’m sorry but with two analyzing chargers and a variety of 18650s (Samsung 25Rs, Samsung 30Qs, LG HG2s) I have not encountered such great variations.

Pages