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Old 08-07-2011, 05:35 AM #1
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Default WF 188 charger questions

I have the WF-188 charger and I have been trying to charge my 18650s protected and non protected. The charger only seems to charge them to about 3.8v and then stops. However when I put it in a cheap china charger than came with my batteries, they continue to charge till they cut out at about 4.2v

Is this a problem with the charger or the batteries? I have the settings on 3.7v and have tried both 300mA and 650mA charging


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Old 08-07-2011, 07:00 AM #2
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Default Re: WF 188 charger questions

Those chargers are notorious for not charging to the full 4.2v.

I have 5 of them and they all charge only up to 3.9v-4.1v.

my cheapie chargers charge full as well, like you said.
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Old 08-07-2011, 08:40 AM #3
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Default Re: WF 188 charger questions

I actually havent measured my wf-118...

I am going to have to do that soon. I hope it charges to 4.2volts...
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Old 08-07-2011, 02:36 PM #4
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Default Re: WF 188 charger questions

Hmmmmm so I just tried charging another battery. It was at ~ 3.8v and it charged it to 4.1v at the same time, it wouldn't let me charge a protected 18650 at 3.7v.....
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Old 08-07-2011, 03:05 PM #5
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Default Re: WF 188 charger questions

Part of the problem with those chargers is the rail system. The contacts inside are poor and give false readings which don't let batteries charge when they need to be charged. I pull the charger apart and get rid of the slides. I then solder flexible silicone wire to give positive contact. This solves the problems where it wont charge.

As far as the high charge cutoff point, there is nothing to do about it.

The only reason I use this charger is because it charges everything...even my massive 32600's.
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Old 08-08-2011, 03:55 PM #6
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Default Re: WF 188 charger questions

Unhappy 18650
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Old 08-08-2011, 04:03 PM #7
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Default Re: WF 188 charger questions

Out of the 10 or 20 of the WF-188 chargers that I have tested, every one of the brand new ones that have the blue box, have all been just fine. (all the ones that I got from lighthound)

And just about every single one of the cheaper (supposedly brand new) ones that I have gotten from other sources (like ebay or other cheap sellers), have been delivered only in the bubble wrap. Not in the box.

And all of those have been crap. Like maybe they were selling returned or faulty chargers or something...
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Old 08-08-2011, 04:12 PM #8
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Default Re: WF 188 charger questions

Quote:
Originally Posted by jayrob View Post
Out of the 10 or 20 of the WF-188 chargers that I have tested, every one of the brand new ones that have the blue box, have all been just fine. (all the ones that I got from lighthound)

And just about every single one of the cheaper (supposedly brand new) ones that I have gotten from other sources (like ebay or other cheap sellers), have been delivered only in the bubble wrap. Not in the box.

And all of those have been crap. Like maybe they were selling returned or faulty chargers or something...
Hmm... interesting thought. You could be right.
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615mw 405nm/12X Spiderfire X-03
148mw 405nm/GGW in my "Hotlight-Saber" host
1920mw 445nm River Rock custom
1530mw 445nm Yobresal
1360mw 445nm Qumefox Sipik
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Old 08-09-2011, 06:33 PM #9
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Default Re: WF 188 charger questions

I got my WF-188 from ebay (china or H.Kong) unboxed just bubble wrapped. Last night I charged all 5 of my 18650's (mix of Sanyo & Tenergy unprotected) and my results were a range of 3.85v-4.3v with an average of 4.03v. My results seem to mirror rocket689's. Taking it apart and soldering a wire is an interesting idea, I may try that.
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Old 08-09-2011, 06:47 PM #10
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Default Re: WF 188 charger questions

Quote:
Originally Posted by SpecV View Post
I got my WF-188 from ebay (china or H.Kong) unboxed just bubble wrapped. Last night I charged all 5 of my 18650's (mix of Sanyo & Tenergy unprotected) and my results were a range of 3.85v-4.3v with an average of 4.03v. My results seem to mirror rocket689's. Taking it apart and soldering a wire is an interesting idea, I may try that.
Yup, that sounds familiar.... all of mine either came from china via Ebay or DX (unboxed/ wrapped in bubble wrap)
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615mw 405nm/12X Spiderfire X-03
148mw 405nm/GGW in my "Hotlight-Saber" host
1920mw 445nm River Rock custom
1530mw 445nm Yobresal
1360mw 445nm Qumefox Sipik
800mw 445nm WL Arctic Spyder S3
240mw 473nm CNI Labby
8mw 473nm CNI Labby
528mw 532nm Lazerer Cannon
310mw 532nm Firedragon III
300mw 532nm CNI Labby
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900mw 635nm in Temporary Finned Labby Sink
Several 635nm diodes awaiting a build
500mw 650nm Dual LPC-826 Labby
251mw 650nm/LPC-815 Ultrafire U-501B
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Old 08-09-2011, 07:00 PM #11
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Default Re: WF 188 charger questions

Had problems with almost every one I ever got from DX charging to the right voltage but I only had one with and issue (bad rail would not charge in one of the slots fixed it) from Kaidomain. All the ones I actually tested for voltage and the one I use from Kaidomain came out about +/-.05V from 4.2V depending on the cell. I would bet DX is buying one-off ones from the manufacturer or just plain knockoffs and is why a lot of people are experiencing problems.

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Old 08-09-2011, 08:32 PM #12
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Default Re: WF 188 charger questions

I have removed the rails. soldered wires on and will report back new charging results. I couldn't resist trying this little mod
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Old 08-09-2011, 10:31 PM #13
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Default Re: WF 188 charger questions

Although my avg has dropped a little to 3.985v, now every batt has charged to a min of 3.95v which is up from 3.85v. Looks like this mod has reduced the range of volts so they are all closer to 4v but not any higher . I still like this charger though
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Old 08-09-2011, 10:43 PM #14
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Default Re: WF 188 charger questions

I really need to get my sales thread up for my tested chargers with the rail fixes already applied. :P
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Old 08-10-2011, 05:12 AM #15
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Default Re: WF 188 charger questions

Well I did the soldering job and I have seen an improvement!. It is now charging consistently at ~4.2v whereas it would previously be doing ~4.0v. Just waiting for the battery to charge and I see what voltage it charges up to

Edit: ~4.15v

Last edited by azzman372; 08-10-2011 at 12:53 PM.
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Old 08-10-2011, 12:47 PM #16
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Default Re: WF 188 charger questions

Quote:
Originally Posted by azzman372 View Post
Well I did the soldering job and I have seen an improvement!. It is now charging consistently at ~4.2v whereas it would previously be doing ~4.0v. Just waiting for the battery to charge and I see what voltage it charges up to
Im glad to hear that the mod helped.
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