Wiggle
Flashlight Enthusiast
Ah gotcha, thanks for the clarification.
No.
The supplied power supply is 3A and doing an average of my measured current for the first 15 minutes gives 2.2A.
With NiMH the average is 1.3A
Thanks for the measurements -
here's a more simple minded explanation -
4x NiMH AA @ 1Amp charge current each is 4x 1.2V x 1A = 4.8watts
(to perhaps 6watts max - these are worst possible cases where if it were theoretically possible for the cells to start at 0 Volts!!!)
The power supply is rated for 3Amps BUT @ 12Volts = 3Ax12V = 36watts
so the power supply should be more than adequate to charge 4x NiMH AA batteries.
I would have thought it was adequate for 2Amps for 4x NiMH AA -
but seems from HKJ's figures it probably would not for the first 15mins -
but it ought to be able to support a charge current of 1.2+Amps for 4x NiMH AA.
You did not read the 3. line in my reply, that contains the current reading for NiMH.
When charging NiMH the voltage is up to 1.5 volt, i.e. you are charging 6 watt to charge.into the batteries, not 4.8 watt.
Also note that my current calculation was for the first 15 minutes, but the highest current will be drawn just before the charger starts reducing the charge current, at least if the converter inside the charger has the same efficiency.
I could easily add a "Average DC current" trace, but I believe that there is already to many traces in the chart.
I would have thought it was adequate for 2Amps for 4x NiMH AA -
but seems from HKJ's figures it probably would not for the first 15mins -
but it ought to be able to support a charge current of 1.2+Amps for 4x NiMH AA.
(to perhaps 6watts max -
The maximum power draw from the supply is not when the batteries has 0 volt, but just before the charger stops or reduces current.
0 volt at X amperes only requires -> 0*X -> 0 watt.
The charger has more than enough power to charge at NiMH 2A. It is probably done the way it is to make NiMH and LiIon as equal as possible.
perhaps I ought to explain my 0volt comment -
I was thinking in terms of the difference between a "full" battery and one that was "empty" -
I used a theoretical empty battery as 0volts (which I know is not physically possible)
Would you please explain why the current draw on charger power supply is 2.2A for the first 15minutes ?
But as I written before: The maximum power draw is when the battery is nearly full.
I did an average of the first 1000 data point in my log file, that is the reason that the value is for the first 15 minutes (I log one record each 0.9 second). I could have done the average anywhere in the logfile, but the beginning is easy to find. The end is not usable, except if I want the idle current.
The charger is charging with 1A at about 3.5 volt (LiIon see charge curve in review), this means the charge power is 1A*3.5V*4 -> 14 watt, but it uses 2.2*12 -> 26.4 watt from the power supply
For 4x NiMH AA is the initial current draw different, please?
That was the 3. line I was referring to before, the current draw is 1.3A.
So there is no peak current draw for the first 15mins from the power supply when charging 4x NiMH AA?
Therefore it is more than adequate to support even 2A charge current for 4x NiMH?
Nothing extraordinary, there is 3A peaks each cycle, but with LiIon it has 6A peaks.
Yes, it has power enough.
In the first version of the charger channel #1 & #4 had a different circuit, but in this version it looks like all channels are the same.
My guess is that it could be changed in software (if the charger has enough cooling).
Can anyone tell me whether the Opus or the Sysmax/Nitecore i4 Intellicharger would be the better one-solution charger?
I have batteries from 10280 > 18650 and a few other points in between.
Can anyone tell me whether the Opus or the Sysmax/Nitecore i4 Intellicharger would be the better one-solution charger?
I have batteries from 10280 > 18650 and a few other points in between.
niiiiiiiiiiiiiiiice test TATASAL ! so the quality of testing of this charger is = to an hobby charger. very, but very good !!!!
I RECEIVED THIS CHARGER!!!
i am wondering 1 thing. could i use this charger to TEST the real mah of a smartphone battery?
i should connect + and - poles and do the test. BUT I DON'T KNOW if smarphone batteries do have 4,2 or 4,35 cut off voltage while charging.
something like this http://www.batterymart.com/images/products/alt/usc-002.jpg
and second problem, i should find an adjustable cradles for flat liion cell. i found some cradles chat charges ALL TYPE/BRAND of battery(with adjustable pins), should i consider to buy it opening it, and leave all electronic just to use the basic "cradle" funcion?