Test/review of Efan Lux S4 LCD charger

HKJ

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Joined
Mar 26, 2008
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Copenhagen, Denmark
[SIZE=+3]Efan Lux S4 LCD charger[/SIZE]

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This is a analyzing charger from Efan (Eizfan), there is no buttons on it because it uses a color touchscreen for user interface.



I got the charger in a cardboard box, if has a good picture of the charger and specifications on the back.

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The pack included the charger, a power supply, a mains cable, a manual and probes for internal resistance measurement.

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The charger use 12V 5A power and the mains power supply is included. The probes for internal resistance is connected to the "IR TEST" socket when measuring IR. The DATA connector is for firmware upgrade

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The charger shows a animation during power on.

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This is the idle picture when no batteries are in the charger. When a battery is put in the battery symbol is selected and it is possible to press on it to select settings.

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There are 3 settings screens, the first one for mode, the second for current.

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And the last for chemistry

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Pressing the "R" button will show the internal resistance measurement screen.

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Some examples on charging/discharging screens, the curve is drawn while working and the horizontal scale will change as needed.
There is no indication of charge/discharge current, it must be inferenced from the slope of the voltage curve.

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The probes for internal resistance measurement, they are not 4-terminal, but the circuit in the charger may eliminate the resistance in the connector.

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The probes includes tip protectors

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They are connected to the usb plug on the back of the charger.

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And pressed against the battery ends to measure internal resistance.



The charger has a small fan, it is temperature controlled and starts when needed, but it is rather noisy.

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The charger has the usual slider construction. It can handle from 33mm to 76mm, this is most common cells on the market.

supportedBatteryTypes.png


supportedBatterySizes.png

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32xxx and D do not really fit in the charger, but it may be possible to put them in.


[SIZE=+2]Measurements charger[/SIZE]


  • Power consumption when idle is 1.6 watt (The power supply uses 0.11 watt in idle).
  • Without power it will discharge a LiIon battery with about 0.5mA
  • Without power it will discharge a NiMH battery with about 0.1mA
  • A full LiIon battery will be charged with 0.6ma
  • Below 0.07V the charger will charge will report error
  • Up to 2V the charger assumes NiMH
  • Above 2V the charge assumes LiIon.
  • Charger will restart if battery voltage drops below 3.9V in 4.20V mode
  • The charger will restart when a battery is inserted or power is cycled.
  • The meter has a minimum readout of 0.5V
  • Up to 0.8V the meter is not very precise.
  • From 0.8V to maximum the meter is within 0.05V
  • The meter will never show above maximum battery voltage (3.60V, 4.20V, 4.35V)

[SIZE=+2]Charging 4.2V LiIon[/SIZE]

Current can be selected from 0.5A, 1A, 1.5A and 2A, default is 1A.

EFAN%20S4%201A%20%28SA18650-33%29%20%231.png


This is a nice CC/CV charge curve with termination at around 100mA.
Display shows 3084mAh and 3:58

EFAN%20S4%201A%20%28SA18650-33%29%20%232.png


Display shows 3071mAh and 3:56

EFAN%20S4%201A%20%28SA18650-33%29%20%233.png


Display shows 3106mAh and 5:25

EFAN%20S4%201A%20%28SA18650-33%29%20%234.png


The other 3 channels works the same way.
Display shows 3096mAh and 4:22

EFAN%20S4%201A%20%28SA18650-26%29%20%231.png


Display shows 2485mAh and 3:28

EFAN%20S4%201A%20%28PA18650-31%29%20%231.png


No problem with other capacities.
Display shows 2747mAh and 4:34

EFAN%20S4%201A%20%28BE18650-26%29%20%231.png


The old cell goes into CV mode fairly fast and also stops when the current is down to 100mA
Display shows 1940mAh and 5:13

EFAN%20S4%200.5A%20%28SA18650-33%29%20%231.png


Lower charge current means longer charge time and slightly lower charge voltage, the termination current is the same.
Display shows 3064mAh and 7:42

EFAN%20S4%200.5A%20%28AW18350-IMR%29%20%231.png


This old and worn down cell is handled as fine as possible with 100mA termination current.
Display shows 151mAh and 0:40

EFAN%20S4%200.5A%20%28KP14500-08%29%20%231.png


Same with this cell.
Display shows 688mAh and 1:52

EFAN%20S4%201.5A%20%28SA18650-33%29%20%231.png


The 1.5A setting is fine for 3000mA and larger cells, it will charge a bit faster than the 1A setting.
Display shows 3152mAh and 3:21

EFAN%20S4%202A%20%28SA18650-33%29%20%231.png


The charger can also charge with 2A, the termination current is 100mA. The charging is for high current cells and larger cells it is faster than 1A/1.5A, but there can be a long CV phase.
Display shows 3212mAh and 2:43

EFAN%20S4%202A%20%28SA20700-30%29%20%231.png


Charging a high current cell at 2A is faster, there the CV phase is fairly short.
Display shows 3024mAh and 1:44

EFAN%20S4%202A%20%284xSA18650-33%29.png


The charger can charge 4 batteries at 2A
Display shows 3188mAh,3209mAh,3173mAh,2420mAh and 2:30, 2:26, 2:21, 2:06

EFAN%20S4%202A%2012V%20%284xSA18650-33%29.png


It need about 4A from 12V to do it.
Display shows 3159mAh, 3241mAh, 3205mAh, 3151mAh and 3:04, 2:25, 2:19, 2:29

Temp5591.png


When charging 4x2A it do get a bit warm, especially the battery nearest the display.
M1: 48.1°C, M2: 43.6°C, M3: 41.0°C, M4: 39.0°C, HS1: 58.8°C

Temp5592.png


M1: 53.0°C, M2: 43.0°C, HS1: 64.6°C

PoweronLiIon.png


The charger starts very slowly, this gives the user time to change mode or battery type.

CurrentChangeLiIon.png


It is possible to change current at any time during the charge.



[SIZE=+2]Discharging 4.2V LiIon[/SIZE]

Discharging is with a constant 0.5A current.

EFAN%20S4%200.5A%20discharge%20%28SA18650-33%29%20%231.png


The charger will discharge to about 2.8V with a constant current, i.e. not PWM.
Display shows 2995mAh and 6:06

EFAN%20S4%200.5A%20discharge%20%28SA18650-33%29%20%232.png


Display shows 3044mAh and 6:12

EFAN%20S4%200.5A%20discharge%20%28SA18650-33%29%20%233.png


Display shows 3074mAh and 6:16

EFAN%20S4%200.5A%20discharge%20%28SA18650-33%29%20%234.png


The other slots look similar.
Display shows 3085mAh and 6:14

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With a fan in the charger it is no problem discharging 4 batteries.
Display shows 3070mAh ,3185mAh ,3149mAh ,3079mAh and 6:16, 6:29, 6:25, 6:17

Temp5599.png


M1: 39.7°C, M2: 35.2°C, M3: 32.7°C, M4: 30.9°C, M5: 46.2°C, HS1: 53.9°C

DischargeLiIon.png


No PWM when discharging.



[SIZE=+2]Capacity test 4.2V LiIon[/SIZE]

A capacity test consist of charging the battery, discharging it and final charging it again. The discharge current is fixed at 0.5A, the two charge cycles can be selected from 0.5A, 1A, 1.5A and 2A, default is 1A

EFAN%20S4%201A%20capacity%20%28SA18650-33%29%20%231.png


Display shows 3037mAh and 14:45



[SIZE=+2]Charging 4.35V LiIon[/SIZE]

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Charging a 4.35V cell looks fine enough.
Display shows 2777mAh and 3:29



[SIZE=+2]Charging 3.6V LiIon (LiFePO4)[/SIZE]

EFAN%20S4%201A%20%2818650-LiFePO4%29%20%231.png


Display shows 1185mAh and 1:43

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Charging LiFePO4 also looks fine enough.
Display shows 508mAh and 1:16



[SIZE=+2]Measuring Internal Resistance LiIon[/SIZE]

The charger do not measure internal resistance in the slots, but uses an external probe.

RILiIon.png


The results looks fairly consistency but the values is not correct, especially the +100mOhm is way to low.

RiLiIonLong.png


The measurement is done with two pulses, at the first pulse the display will show voltage and 0mOhm, at the next pulse the measured resistance will be shows.

RiLiIonZeroPulse.png


RiLiIonMeasurementPulse.png


It looks like a hardware bug with a initial 6A+ current draw and then dropping to around 1A. I will not expect this to affect the measurement.



[SIZE=+2]Charging NiMH[/SIZE]

Current can be selected from 0.5A, 1A, 1.5A and 2A, default is 0.5A. When charging starts the current is locked and cannot be changed.

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The charging is terminated on voltage and then followed by a two hour trickle/top-off charge. The termination looks to be just before the temperature raises to signal full cell. The measured mAh is a bit on the low side.
Display shows 1525mAh and 2:11

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Display shows 1483mAh and 2:08

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Display shows 1536mAh and 2:12

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All slots looks similar.
Display shows 1478mAh and 2:07

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The Pro is charged the same way.
Display shows 2165mAh and 3:03

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The Leise cell is filled completely (Temperature increases).
Display shows 2440mAh and 3:25

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No surprise with the AAA
Display shows 589mAh and 1:42

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The charger has no problem terminating at low charge current, because it uses voltage termination.
Display shows 1601mAh and 4:25

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It can also charger NiMH at 2A, due to the measurement pauses the average current is a bit below 2A.
Display shows 1528mAh and 1:10

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A full cell was not detected before it went to full charge current, but it is still a fairly fast detection. As usual it adds the two hour top-off charge.
Display shows 41mAh and 0:12

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The charger can charge 4 NiMH with 2A each at the same time.

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Charging at 4x2A requires about 2A from the power supply
Display shows 1514mAh ,1622mAh ,1564mAh ,1438mAh and 1:10, 1:14, 1:12, 1:07

Temp5614.png


There is not much heat when charging AA cells.
M1: 31.3°C, M2: 31.3°C, M3: 32.3°C, M4: 30.2°C, HS1: 41.9°C

Temp5615.png

M1: 40.2°C, M2: 30.0°C, HS1: 45.2°C

PoweronNiMHlong.png


The charger has the same startup sequence as LiIon, but in addition it uses a low charge current for the first 10 minutes.

Charging0.5ANiMH.png


As is common with all NiMH chargers the current is turned off to measure the NiMH voltage.

Charging2ANiMH.png


It is the same at 2A.

TrickleNiMH.png


The top-off/trickle charging is pulses

Trickle2APulsNiMH.png


Each pulse is about 1 second wide with 20 second between pulses, this gives an average current of 100mA when using 2A charging. The current will scale with selected charge current.



[SIZE=+2]Discharging NiMH[/SIZE]

Discharging is with a constant 0.5A current.

EFAN%20S4%200.5A%20discharge%20%28eneloop%29%20%231.png


The batteries are discharged to about 1.05V with a constant current.
Display shows 1847mAh and 3:34

EFAN%20S4%200.5A%20discharge%20%28eneloop%29%20%232.png


Display shows 1770mAh and 3:25

EFAN%20S4%200.5A%20discharge%20%28eneloop%29%20%233.png


Display shows 1862mAh and 3:36

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All 4 slots looks similar.
Display shows 1758mAh and 3:24

Temp5630.png


M1: 32.2°C, M2: 29.6°C, M3: 29.1°C, M4: 29.0°C, M5: 37.8°C, HS1: 40.0°C

DischargeNiMH.png


No pwm when discharging.



[SIZE=+2]Capacity NiMH[/SIZE]

A capacity test consist of charging the battery, discharging it and final charging it again. The discharge current is fixed at 0.5A, the two charge cycles can be selected from 0.5A, 1A, 1.5A and 2A, default is 0.5A

EFAN%20S4%201A%20capacity%20%28eneloop%29%20%231.png


Display shows 1818mAh and 7:55



[SIZE=+2]Measuring Internal Resistance NiMH[/SIZE]

The charger do not measure internal resistance in the slots, but uses an external probe.

RINiMH.png


The measurement is fairly consistent, but I am not very impressed with the results here.

RiNiMHlong.png


The measurement is done with two pulses, at the first pulse the display will show voltage and 0mOhm, at the next pulse the measured resistance will be shows.

RiNiMHZeroPulse.png


RiNiMHMeasurementPulse.png


These pulses looks fine enough.



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



[SIZE=+2]Conclusion[/SIZE]

This is a fairly advanced charger with discharge and capacity measurements and 3 LiIon chemistries. The color screen with touch works fine and may allow for updates later on. The charger shows all relevant data on the main screen, but only for one cell at a time.

Generally it is a good charger and analyzer, but capacity when charging NiMH (Discharge and capacity test is fine) and IR measurements are not reliable with the current software.



[SIZE=+3]Notes[/SIZE]

The charger was supplied by Efan for review.

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

Gauss163

Flashlight Enthusiast
Joined
Oct 20, 2013
Messages
1,604
Location
USA
What do you mean by "the display will show voltage a 0mOhm"?

The current street price is $180. I doubt they'll sell many at that price. I'd be surprised if they even sold one.
 

ChrisGarrett

Flashlight Enthusiast
Joined
Feb 2, 2012
Messages
5,725
Location
Miami, Florida
I was talking to my best friend out in Cali yesterday and he was asking about I.R.s on some of his 6 year old PowerEx 2700s. We both got Maha C9000s in early '12 and while he has 3-4 Vinh lights, he's not really geeking out on this stuff too much.

Tells me he just got the Efan LUX S4. Reading here and on HKJ's site, I'm familiar with the brand, but I had to read HJK's review, which is a positive review for the model with a few 'quirks,' like any charger might possess.

I never bothered to check prices, which I just did. Seems MSRP is $179.99 and you can find it like the other guy stated, for $150ish on IMRbatteries.

Yeah...no thanks.

I know he recently bought a few Emisar lights and cells and probably bought them from IMRbatteries, so he just didn't pull that charger out of thin air, on his own, I was a bit surprised, since he was looking at cheap stuff.

Chris
 

tripplec

Enlightened
Joined
Jun 2, 2013
Messages
397
Location
Belleville, Ontario
Maybe he misread the decimal place! Wait tell he sees the credit card bill then. There are a lot of very good chargers. The cost me more as I have to pay on eBay or Amazon.ca in CND money. Ebay tends the be the least costly source for current chargers. Its certiainly not worth $100 more than other proven units.
 
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