$34.37
received
Use coupon: ESYBE4GB For a further price reduction
● App
control: Check
and adjust its charging status at any time
● 2.1
inches LCD screen display
charging mode and battery status
● 5V
1A USB output: Can
be used as power bank to charge your devices
● Compatible with Li-ion,
LiFePO4, Ni-MH and NiCd batteries
● Charges 4 batteries simultaneously, each
of the 4 slots monitors and charges independently
● 4
buttons to
set the charging current and battery type conveniently
● CC
and CV two
charging modes
● Automatically
stops charging when
battery is fully charged
● Activation
function for
Li-ion batteries with protection board
● Reversed
polarity / short-circuit / over-current / over-charge protection
Input: AC 100 - 240V 50 / 60Hz 1A (max)
Output voltage: 4.2V + / - 1pct, 3.6V + / - 1pct, 1.48V + / - 1pct
USB output: 5.0V + / - 5pct, 1A
Output current: Li-ion, LiFePO4: 0.25A / 0.5A / 1A / 2A; Ni-MH, NiCd:
0.25A
E.SYB Website =
http://www.e-syb.com/
What we have here is a very interesting charger , that is equipped with
Bluetooth allowing the charger to be monitored and adjusted via Android
devices ( Phone / tablet ) . ( More later )
I have been charging batteries as quickly as possible to get a feel for
this charger . The first thing I noticed is that this charger uses
voltage as the cut off ( 4.2v ) , and this means that the batteries will
not be 4.2v at completion . So depending on the condition ( internal
resistance ) of the battery , termination voltage ( after 30 minutes of
rest ) has been from 4.11v to 4.16v ( depending on the battery ) . So it
looks like the charger starts with CC and then finishes the charge cycle
with CV . It also looks like the charger tries to maintain CC for as
long as possible , at 0.25Amp charge rate CC looks to be maintained past
4.19v ( voltage under load = charge load ) . Watching the charger
some batteries have dropped charge rate at 4.2v whilst other batteries
are maintaining 0.25Amp .
Can one come to the conclusion that this charger is trying very hard to
speed up the charge time by minimizing trickle time . In the past a
charger would and could trickle on for hours trying to top of a battery
trying for the 4.2v . So it could be that this charger is sacrificing a
little of the top ( Voltage state of the battery ) to greatly speed up
the charge time . Some people may be completely devastated that they
can't get the battery to exactly 4.2v , and yet thousands may rejoice at
the greatly decreased time it takes to charge a battery and not worry
about a few tenths of a volt . Honestly , I was a little surprised at
just how fast this charger charges 18650 . I think the default rate is
0.5Amp if you touch nothing , and just recently I have started to charge
at 0.25Amp to see what the difference might be in terminated voltage .
Variable charge rate :
To change the charge rate , insert a battery . Start pushing the button
above the battery slot before you get a read out ( I do this as mine is
very fast , and if your to slow you can't adjust the charge rate , once
a charge rate is selected ) , keep pushing the button when you get a
read out and you will see you are cycling through the charge rates .
0.25A - 0.5A - 1A - 2A Only slots 1 and 4 offer
2Amps as the maximum charge rate , slots 2 and 3 max out at 1Amp . Once
charge has begun , you can push the button for the corresponding battery
slot to see what is going on , or after completion so how long and how
much current went into the battery .
Termination :
As already mentioned , Voltage is used to terminate that charge cycle (
4.2v ) . Constant Charge rate looks to be maintained for as long as
possible to speed up the time it takes to charge that battery . Remember
voltage under load works both ways , when you discharge a battery the
voltage sags , and when you charge a battery the voltage increases .
Once charging or discharging is completed the battery will come to a
resting voltage . The price for a faster charger looks to be a few tenths of
a volt ( the variable being the quality of the battery charged )
.
Bluetooth :
This is where it gets exciting (?)
Here is a link to a video about QR codes ....
https://www.youtube.com/watch?v=KRq8qnlLqmA
Now most of you folks wont need to learn anything about QR codes ,
because your up to date with mobile phone tech and all that ! Well I'm a
bit of an old fuddy duddy and so I had to learn something ( it is
interesting )
So to get the app , to monitor the charger VIA phone / tablet you need
to take a picture of the QR code with a QR reader app ( Back of the box
or instruction manual ), this will give you a link to the App for the
charger . Hmmmm , perhaps this is something that should be in the
instructions .
Here are some video's made by other people ...
https://www.youtube.com/watch?v=SftxZkDGzfk
= Youtube Video by Suki
https://www.youtube.com/watch?v=YvLNCzW6uNk = Youtube Video by Z
Vaper
Z Vaper has gotten overcharging ( slight ) , but
I have gotten nothing but undercharging ( Thats life ) .
My appologies for not testing bluetooth myself
and fully , but if I can get monitoring VIA PC working I will update the
review .
AA Batteries :
My charger charges at 0.25A ( nimh ) and offers
no other options .
Termination voltage is 1.48v , and depending on
the state of your AA ( nimh ) resting voltage should be north of 1.4v
The charger takes it's time starting as it is
determining just what battery you have installed , so AA's are just a
little slower to start .
Conclusion :
I have put quite a few batteries through the
charger at 0.5A and now 0.25A . It is simply a very fast charger when
compared to most other chargers on the market . It offers functionality
not dreamed of a few years ago , and quite frankly it works .
2 Slots offer up to 2A charge rate
2 Slots offer up to 1A charge rate
Amazingly keeps relatively cool ( ok winter
weather is finally here , so its been very cool even inside ) Haven't
detected any heat at all as yet , this would probably change if charging
4 batteries at maximum rates .. ( At 0.5A and 0.25A ) I have 4
batteries charging right now @ 0.25A and the charger feels cold .
Sliders are very smooth , possibly the smoothest
I have ever seen
Feels like a real quality product , ( punching
well above its price at time of testing )
I don't know what everyone else expects from a
charger these days , but this charger ticks all the boxes for me . 2 amp
charge capability for those larger batteries , 0.25 amp charge for those
smaller batteries , true charge termination , CV termination , CC for as
long as possible to decrease charge time , and minimal trickle charging
.
I still have some 10 or more 18650 to run
through this charger , I am currently charging a 18650 @ 0.25A from 3.6v
and I am looking forward to seeing how long it takes .. ( Have
charged 14 18650 to date )
At this time , the E.SYB E4 charger could
possibly be " The Charger " to own . I have thrown a few AA ( nimh )
into the charger and I really like the result . This is simply the
best charger I have used to date , I really do like it . So far I have
nothing negative to report ( Nothing ) . If you need a score out of ten
, then it has to be 10 ( Yes 10 out of 10 ) ... It is really nice to see
companies come out with products that make the flashlight hobby safer
and more interesting .
I would like to thank May from
Gearbest for making this review
possible ..
Update : 31 May 2016
Ok , using a iPhone ...
1) You can change the charge current on the fly
VIA the App ( Very nice ) , makes me wish you could do it on the charger
.
2) You can monitor the charge progress ( ? )
Ok , pictured is my brothers iPhone ..
Showing is the results of a completed AA nimh
battery . ( A B C D ) the arows show charging options for Li-ion etc (
nimh is stuck @ 0.25A )
I would really like to see a Windows / PC app
for this charger ( Bluetooth ) . I believe sales potential is being some
what limited by not having a Windows / PC app , heck even a Linux app
would be fantastic ... I personally am not much of a phone
fan boy , I don't have one super glued to the side of my face like some
young people today , who would rather text than eat .. E.SYB
, please ! A Windows or Linux app for PC would be crazy great .
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