Xtar WP2 Charger

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old4570
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Xtar WP2 Charger



Im taking a look at the Xtar WP2 Battery charger ..
14500 / 14650 / 17670 / 18500 / 18650 / 18700 

Operating temp 0 - 40deg C
Input 12VDC 650mA
Rated Voltage 4.2v
Constant Charge current 600mA +-10%
Cut off voltage 4.2v +-1%
Cut off Current 60mA +-10%
Weight 70g

The charger comes with a very small power supply [ 12VDC ] , about the size of a mobile phone charger , and it barely seem to get warm charging a single cell at a time . 

The charger does in deed charge at a constant current of 600mA , at least mine did , right up to 4v at which point the charge current began to drop .
@ 4.01v it was 580mA
@ 4.1v it was 280mA
@ 4.14 it was 180mA 
With mine the termination current [ just before going green ] was 65mA . 
Now this charger does not fully terminate , I did monitor a current of 0.04mA , and then it would jump to 0.11mA , then back to 0.04mA , and then up to say 0.23mA and back again to 0.04mA .
I can only suggest that this behavior is a form of monitoring the state of the battery , as it seems to mimic the way the battery is charged , which is similar to the WF-139 , a sort of pulse charging , whereby the charger stops to monitor the battery state then continues charging . 

I cant say this is a bad thing as the current is so low , that it would take several hours just to feed the battery a single mA , so pulling the battery is no where near as critical , as with a charger , trickle charging at 40mA . 
In fact this monitoring , I believe is a feature of this charger , for long term storage of the battery in the charger , so when the battery discharges to a certain level , the charger automatically tops it up again , and then continues monitoring the battery . [ As to whether you wish to use such a feature , I leave up to you ]

I put several batteries through this charger , and they terminated from 4.15v all the way to 4.19v . I dare say we have another charger that may be sensitive to the internal resistance of batteries as they near max charge . [ Maybe ] The charge voltage seems to about 0.09v above the battery voltage as its charging , until about the end when it seems to max out at 4.22v or so .

Overall , Im impressed with this charger , Its brand new , and this one was sourced from flea bay . The very low monitoring current at the end of the charge is so low as not to be an issue , and I would be personally in no real hurry to pull the batteries , I would rate this a very decent charger for the money , and one which should not have any issues with the length of 18650 batteries .

There you have it , another weapon to chose from to charge those 18650's

 

Does not seem to get much play on the other Forum ..

This charger should be given some consideration , considering its not too bad for the $$  

 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 ….

 

Edited by: old4570 on 03/30/2011 - 16:24
Budgeteer
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I have it and you beat me on the review. I agree with your review in all aspects. Mine has the EU plug however.

kragmutt wrote:

They're gonna send you a green redcat with a black LED.

agenthex
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Probably the best anywhere near this price range. Only hamper by the lack of explicite 16340 support (needs metal spacer).

Reading this makes you smarter: http://lesswrong.com/

Budgeteer
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By far the best in that price range.

kragmutt wrote:

They're gonna send you a green redcat with a black LED.

Oldienea
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I appreciate your work.

I have to get one of these as soon as possible.

Budgeteer
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Mine came stock with car and 230VAC adapter. Well made.

kragmutt wrote:

They're gonna send you a green redcat with a black LED.

brted
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Are the two bays independent?

Budgeteer
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Yep.

kragmutt wrote:

They're gonna send you a green redcat with a black LED.

Kokopelli
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How's this XTAR charger compared to, lets say, a double bay Trustfire? I have a Trustfire charger and another one bay, portable one. I recently got a Powerex charger for my NiMH's and I believe I could buy something better for my LiIons also. How well does an XTar fill the bill? 

old4570
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Hmmm , its more sensitive to internal resistance [ so if a cell has higher internal resistance it will terminate charging earlier ] Xtar ...

The Trustfire will continue charging to termination voltage ... And then Trickle charge ..

While the Xtar will stop charging on termination . [ small , very small monitoring current = not worth worrying about ] 

I have both and use both ...  Sometime's you want the battery to terminate @ 4.2v [ battery tests and such ] 

If you wish to check on the internal rersistance , throw it in the Xtar and see where it terminates ... 

 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 ….

 

Budgeteer
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My WP2 sample does the following (i use the MP1 more often):

XTAR 2400mAh protected 4,19V cutoff (few cycles)

Hi-MAX 2600mAh protected 4,19V cutoff (few cycles)

Salvaged sony unprotected from laptop 2000mAh = 4,20 cutoff (many cycles, 1y old or more, probably way more)

trustfire grey 16340 protected charged with help of a a spacer 4,17V

kragmutt wrote:

They're gonna send you a green redcat with a black LED.

Volk
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I bought this one for a friend and made a test charge on two pink protected UltraFire 18650 2600mAh.

Battery 1: New, about 4 cycles. Cutoff at 4.16V, 4.16V after a couple of hours resting.

Battery 2: Old, about 2 years, MANY cycles. Cutoff at 4.18V, 4.16 after a couple of hours resting.

I then used my Turnigy Accucel 6 to top them off.

Battery 1: 70 mAh

Battery 2: 73 mAh

 

Not a very scientific test, but still.

I like this charger. I doesn't overcharge and that to me is the most important part, feels safe. The cells are around 2400mAh so "loosing" about 70mAh I feel is OK as long as you can trust the charger not making a fire. From what I've read and with this test I certainly would like to recommend this one as a good cheap charger.

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Budgeteer wrote:

I have it and you beat me on the review. I agree with your review in all aspects. Mine has the EU plug however.

 

Where did you buy it? Manafont only sells US plugs so i would have to buy a converter piece. 

anyone knows about this one? http://www.manafont.com/product_info.php/trustfire-multifunction-liion-b...

 

 
asot
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I (also) have a EU version, very reliable

Look at ebay

 

eg items

160628160103

390227171686

atbglenn
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I ordered one off ebay last week. Got it for $13 with free shipping. The delivery estimate is almost 2 months, but it's already shipped. Can't imagine it taking more than a few weeks..

 

http://cgi.ebay.com/XTAR-WP2-Battery-Charger-/170671437988?pt=US_Flashlights&hash=item27bccf78a4#ht_1483wt_1037

ChibiM
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atbglenn, thanks for the link.. will keep that in mind.. only 13dollars is a pretty good deal

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ChibiM wrote:

atbglenn, thanks for the link.. will keep that in mind.. only 13dollars is a pretty good deal

Sure thing Smile I used the "best offer" thingy and saved 69 cents off his $13.69 "buy it now" price. I offer him $11, he counter offered at $13..

ChibiM
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I even just tried a 10 dollar offer.. will wait for him to answer it...

anyway a 13 dollars xtar isnt to bad either.

atbglenn
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ChibiM wrote:

I even just tried a 10 dollar offer.. will wait for him to answer it...

anyway a 13 dollars xtar isnt to bad either.

Best of luck with your offer!  Maybe you'll do better than I did Smile 

ChibiM
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Thanks..;)

SashiX
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atbglenn wrote:

I ordered one off ebay last week. Got it for $13 with free shipping. The delivery estimate is almost 2 months, but it's already shipped. Can't imagine it taking more than a few weeks..

 

http://cgi.ebay.com/XTAR-WP2-Battery-Charger-/170671437988?pt=US_Flashlights&hash=item27bccf78a4#ht_1483wt_1037

Hm, black one with white text? Flat Stare AFAIK, original WP2 is made from grey plastic (top part, and black bottom part) and "DC 12V" text is not written with white paint :~ Fake WP2?

atbglenn
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Fake?? I guess it could be. Maybe they changed the design slightly?? I guess I'll know more when I receive mine.. 

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atbglenn wrote:

Maybe they changed the design slightly??

Yup, perhaps new batch. But... I'm still leaning towards a fake WP2 Oops Anyway, hope it works equally well for you, glenn, but yeah, keep eye on it while charging. Just in case Wink

atbglenn
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SashiX wrote:

atbglenn wrote:

Maybe they changed the design slightly??

Yup, perhaps new batch. But... I'm still leaning towards a fake WP2 Oops Anyway, hope it works equally well for you, glenn, but yeah, keep eye on it while charging. Just in case Wink

SashiX, thanks for the heads up. I'll measure the charge current and voltage with my Fluke 189 multimeter. I'm very careful, especially with 18650's. I charge my batteries in my detached garage away from anything combustible.  Paranoid is my middle name lol!

SashiX
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Paranoid? Don't think so, we just need to be careful with this things. Better safe than sorry. :bigsmile:

atbglenn
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I finally got my charger. The only question is, real or fake? Question: For some reason I can't get images to display in this forum. I have no problem in other forums I belong to. What am I doing wrong?

http://i135.photobucket.com/albums/q146/atbglenn/misc/b38778b5.jpg

http://i135.photobucket.com/albums/q146/atbglenn/misc/3f62a1bf.jpg

SashiX
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Similar to "new"(?) WP2 II. Could be slightly redesigned body.

atbglenn
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I'm charging ultrafire 3200 mAh's I have on hand right now. I know they're not great batteries, but they're all I have right now and they do just fine in my Fenix TK35. I do have Xtar 2600's and Panasonic 2900's on order. Hopefully they will arrive soon. I'll measure voltage when charging is complete.

SashiX
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Keep us informed Wink

atbglenn
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Here's my findings so far. The charge current pulses on and off at a fast rate according to my Fluke 189 multimeter. Isn't it supposed to be constant current?  It does read a little over 600 ma on peaks. Again I'm using cheap Ultrafire 3200mAh cells. Also the end charge voltage is around 4.09. Is this due to the fact I'm using sub standard cells? Or do I have a fake charger? (I only paid $13 for it) 

SashiX
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That Fluke is awesome Silly Check this review, glenn. WP2 tends to terminate early (not a bad thing, actually. will extend cell life). And yes, it depends on cell also. If you need to charge it further, charge it again. I think (for a 18650 cell) you will need half an hour more, just wait till it turns green again Wink

So, if you can make graph like that (in the review I mean), you'll see if it's a good WP2 or a fake one. I think it's a good one, they (Xtar) just chaged it a bit. 

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