Test/Review of Charger Skilhunt M4D

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sjlouis
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I suppose the DMM is a voltmeter. I've done the tests the same days for the "old" batteries and the new ones. I don't think it have a problem and the screen display is good.

For the LiitoKala Lii-500, you said it doesn't charge completely the Nimh, ~15% are not filled (for example 2100 instead of 2450). It's bad sad.

For the Opus, you said :

" the peak charge and discharge current for LiIon are a bit high"

Perhaps I have to buy the first one for Li-ion and the second for NimH, or the Skilhunt for charging and one of the 2 others for refresh and analyzing sadwink.

I've seen on Gearbest, there is an Opus v2.2. Perhaps, it's better.

http://www.gearbest.com/chargers/pp_173012.html

Yes sometimes, I bought in USA and the last time, the vendor asked 84 $ for shipping a motorbike saddle sad. It was more expensive than the saddle. If you buy all the products you test, it would cost a lot. Are you a little mad or a fanatic charger lover wink?

On Fasstech specifications, some few batteries have a ceiling of 4.35 V as the Panasonic of the first link I gave you.

I have a headache with all this English, it's exhausting surprisewink.

HKJ
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sjlouis wrote:

Ok I've red the capacity test and if I understand the first graphic (discharge test), for the other…

For the second, does it means the battery lost ~0.5 V in 25 hours when the battery is out of a lamp or a charger?

The second curve is exactly the same as the first, I just uses a time scale instead of a Ah scale. In both cases I am discharging the battery in pulses of 0.1Ah.

sjlouis wrote:

For the graphics with "With load, 10 s, 30 s… 60 mn", I don't understand at all. Is the red curve represents the charge when you measure the voltage immediately after you stop the flashlight and 60 mn the voltage after 60 mn of rest (battery out of the lamp during 60 mn)?

The time is how long I wait before measuring the voltage, after I have removed the load. The red curve is measured while the battery is loaded, the other some time after the load is removed (I do not use a flashlight, but some fancy computer controlled measuring equipment).

sjlouis wrote:

I suppose the DMM is a voltmeter. I've done the tests the same days for the "old" batteries and the new ones. I don't think it have a problem and the screen display is good.

DMM is “Digital Multi Meter”, i.e. a voltmeter. Usual a cheap voltmeter will show too high value when the battery is nearly empty. This means it is always a good idea to try a new battery in the DMM when a value is higher than expected.

sjlouis wrote:

For the LiitoKala Lii-500, you said it doesn't charge completely the Nimh, ~15% are not filled (for example 2100 instead of 2450). It's bad sad.

Most people will barely notice this in practical usage.

sjlouis wrote:

For the Opus, you said :

" the peak charge and discharge current for LiIon are a bit high"

This is mostly an issue with smaller cells, for 18650 it is not important.

sjlouis wrote:

If you buy all the products you test, it would cost a lot. Are you a little mad or a fanatic charger lover wink?

I do not buy everything, I do also get a lot from manufacturers and/or dealers. A lot of the people that add contents to forums can be called a little mad, it requires time and dedication and you do not really get anything for it, except the pleasure of doing it.

sjlouis wrote:

On Fasstech specifications, some few batteries have a ceiling of 4.35 V as the Panasonic of the first link I gave you.

I have a headache with all this English, it's exhausting surprisewink.

The NCR18650B is a 4.20 volt cell according to the Panasonic datasheet, but somebody has published the wrong 4.35V specification from the start (When possible I check the manufacturers datasheet for cells).

My website with reviews of many chargers and batteries (More than 1000): https://lygte-info.dk/

sjlouis
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I bought my multimeter in Otelo in France (http://www.otelo.fr/fr/index.html). It's a specialist which sell equipment for industry. I buy in this shop tools for my milling and my lathe. It's not a very powerful device but I think it's serious wink.

HKJ wrote:
The second curve is exactly the same as the first, I just uses a time scale instead of a Ah scale. In both cases I am discharging the battery in pulses of 0.1Ah.

Ok I didn't understand because there is 1 A on the title of the board and 25 h x 1 A is not possible. Then I don't know what is 1 A.

 

HKJ wrote:
The time is how long I wait before measuring the voltage, after I have removed the load. The red curve is measured while the battery is loaded, the other some time after the load is removed (I do not use a flashlight, but some fancy computer controlled measuring equipment).

What do you call "the load"? For me, we load the battery in the charger. Ok, when you stop to use the flashlight and removed the battery, the voltage climb a little and this elevation is more important if you wait more.

In the lamp I bough a few weeks ago, the light became low and when I removed the batteries, there were at 2.85 V. I tried to charge them with the lamp charger but it doesn't work and the voltage falls to 0.3 V !!! After a few days it climbed to 1.8 V. I loaded them to 4.35 V sad. I think it's time to buy a good charger.

 

HKJ wrote:
sjlouis wrote:
For the LiitoKala Lii-500, you said it doesn't charge completely the Nimh, ~15% are not filled (for example 2100 instead of 2450). It's bad sad.

Most people will barely notice this in practical usage.

Ok, but I think 350 mA is too important. 5% why not, 15 % no.

 

HKJ wrote:
sjlouis wrote:
For the Opus, you said :

" the peak charge and discharge current for LiIon are a bit high"

This is mostly an issue with smaller cells, for 18650 it is not important.

Ok and it would be interesting you can test the new version 2.2 wink.

 

HKJ wrote:
I do not buy everything, I do also get a lot from manufacturers and/or dealers. A lot of the people that add contents to forums can be called a little mad, it requires time and dedication and you do not really get anything for it, except *the pleasure of doing it*.

Ok, thank you very much for your job laugh.

HKJ
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sjlouis wrote:

Ok I didn't understand because there is 1 A on the title of the board and 25 h x 1 A is not possible. Then I don't know what is 1 A.

To discharge 0.1Ah I discharge with 1A for 6 minutes (1/10 hour)

sjlouis wrote:
What do you call “the load”?

A load is anything that uses power from the battery. This has nothing with loading the charger to do.

sjlouis wrote:

Ok and it would be interesting you can test the new version 2.2 wink.

The differences are very small and because of that I do not really see a reason to do 3-4 week testing on the updated version.

My website with reviews of many chargers and batteries (More than 1000): https://lygte-info.dk/

sjlouis
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Ok for “to load”, in French, it’s not the same meaning.

When the manufacturer modifies a charger, he says you exactly what he have corrected? And for the Opus, it’s not really interesting?

HKJ
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sjlouis wrote:
When the manufacturer modifies a charger, he says you exactly what he have corrected? And for the Opus, it’s not really interesting?

Usual not, but this time it was posted what the change was.

My website with reviews of many chargers and batteries (More than 1000): https://lygte-info.dk/

sjlouis
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Ok, thank you HKJ smile .

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