# KD Li-ion C-D 4.2v Charger

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old4570
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Location: Land of Oz
KD Li-ion C-D 4.2v Charger

Pictured KD charger + D cradle hooked up to Amp meter + 18650 cradle

http://www.kaidomain.com/ProductDetails.aspx?ProductID=2735

Testing ATM :

Always remember , the easiest thing in the world to do , is to expel hot air from your lungs and through some vocal chords ..
The resulting sound may , or may not be worth listening too ….

old4570
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Last seen: 4 days 19 hours ago
Joined: 09/06/2010 - 02:44
Posts: 3425
Location: Land of Oz

The charger is some what sensitive to extra resistance , adding the MM to measure current dropped the charge rate by 300mA when charging at 1A ..

So I have no idea , how much affect it had at higher current ...

As pictured you can see my 1A meter in the circuit , so this should be accurate ...

1A+ charge to about 3.5v Battery Voltage , Charge Voltage 3.77v

Charge Current 900mA = charge voltage of 3.83v = 3.6v for battery

CC 800mA = CV of 3.92v = 3.67v for battery

CC 700mA = CV of 3.92v = 3.79v for battery

CC 600mA = CV of 3.96v = 3.83v for battery

cc 500mA = CV of 4v = 3.89v for battery

cc 400mA = CV of 4.05v = 3.97v for battery

cc 300mA = CV of 4.1v = 4.04v for battery

cc 250mA = CV of 4.12v = 4.07v for battery

cc 200mA = CV of 4.14v = 4.1v for battery

cc 100mA = CV of 4.19v = 4.17v for battery

cc 80mA = CV of 4.2v = 4.18v for battery

cc 50mA = CV of 4.21-4.22v = 4.2v for battery

cc 40mA = CV of 4.22v = 4.21 for battery

cc 30mA = CV of 4.23v = 4.22v for battery

cc 10mA = CV 4.23-4.24v = 4.23v for battery

Ok , this charger is supposed to terminate and not trickle charge , I cant see it , if anything it appears to be trickle charging ...

It may be trying to terminate at 4.24v [ open circuit voltage ] , and it does push the current to the battery , it does not appear to be sensitive to internal resistance at all .

Waiting for the charger to end is painful , a regular charger like a WF-139 or a Trustfire TR-001 , or something along those lines would be almost as quick ..

Now I did discharge the battery down to 3v , and the charger appears to start around 1.5A at this voltage , maybe higher , as the MM dropped the charge current .

So the initial charge rate is fast , but towards the end it slows down so much that the Xtar or WF-188 may be actually faster ..

Now this charger was designed for C and D sized Li-ion cells , but they would take twice as long to charge due to the current dropping so much towards the end .

Now if you want to force cells to 4.2v , well , here you go , it certainly is capable of that I can tell you , maybe good if you wish to condition cells or try to recover lost capacity .

I think this would be a great unit if it stopped at 4.2v , and I dont regret buying it as it does actually force cells to 4.2v ..

Im going to have to buy a Volt meter so that I can see when to pull the battery ...

I will test again with my Samsung 30A [ 4.35v ] and see if it terminates or simply keeps trickle charging [ 3.5mA last I checked ]

Question ?  Do you need this charger , cos if not ?

Always remember , the easiest thing in the world to do , is to expel hot air from your lungs and through some vocal chords ..
The resulting sound may , or may not be worth listening too ….

SashiX
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Joined: 10/07/2010 - 15:46
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Location: Spain

There are C and D sized Li-ion cells?

Don
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Last seen: 1 year 2 months ago
Joined: 01/12/2010 - 16:32
Posts: 6617
Location: Scotland

Yes, I've been using a pair of 32600 cells (D) from KD for a couple of years.

DX will sell you 25500 cells (C)

Quality? Anyone's guess.

The numbers from my light tests are always to be found here.

Match
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Last seen: 5 years 9 months ago
Joined: 11/14/2010 - 11:57
Posts: 1488
Location: South Carolina, USA

I've been using these 25500's from DX, rated at 5500mah.  They're a bit overrated, but despite that they've performed wonderfully in my 2c mag mod.