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Is my charger faulty or just my batteries are going bad?
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#1 (permalink)      10/22/2021 4:12:32 AM US Central   quote/reply + tips
RattyRat
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Is my charger faulty or just my batteries are going bad?
Hey,
so bought a VC2S about 6 months ago. It worked like a charm, 2A ccr, pretty accurate capacity and voltage reading.

I'm using Samsung 25R (6M) and 30T batteries, 99% of the time they were charged by this vc2s...
They still work well in my protected VW mods, just like when they were brand new... BUT
Problem 1.)
When I wanna charge them, the vc2s somethims shows the battery has 3,5-3,8 Volts but the ch1/ch2 light won't change from green to red.
Problem 2.)
light change from green to red so it starts charging, but when I change form CAP to CCR to see it's really getting current the light changes back to green.
Problem 3.)
CCR shows it charges with 150-300mA... so yeah that's slow... battery still charging after 12h.
Problem 4.)
1battery already charging in one slot, and when I put in the second one either the the first one turns immediately green (stops charging) or the second just won't start charging.

Sometimes pull out - plug in the charger helps... sometimes don't...

Now I writed this down I am pretty sure my charger is faulty... but hey i know nothing about electronics... so yeah my question still stands... Is my charger belongs to the bin? already time to get a new one?
Thanks in advance
#2 (permalink)      10/22/2021 4:33:42 AM US Central   quote/reply + tips
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analogueman
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Sounds like the charger is at fault, but you could verify it's not your batteries by trying it with a pair of new cells instead of your well-used ones.

Chargers aren't expensive these days, and some don't seem to last as long in service as we like to think they should. Six months use isn't that long though, and one would expect a longer life than that, but as with anything manufactured, stuff sometimes goes bad earlier than expected, even with decent makes like Xtar.
It's twelve inches long, but don't use it as a rule...
#3 (permalink)      10/22/2021 6:19:43 AM US Central   quote/reply + tips
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AlienGrey
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Does the XTAR VC2S use an external charger?

If so it could also be charger and not the XTAR VC2S that is faulty.
"The Truth Is Out There"
#4 (permalink)      10/22/2021 6:38:57 AM US Central   quote/reply + tips
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carrion4worm
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you mean "cord"?
What does he mean when he says words?
#5 (permalink)      10/22/2021 7:17:10 AM US Central   quote/reply + tips
RattyRat
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Think he means the power supply, you know the blocky thing you plug in to the power and has the usb output...


Good idea, never tought about that can be the problem... that's also aan xtar product, (5V, 2,1A output) bought it along with the charger, just to have one that really can do 2Amps.

I look around maybe I can find some other so I can test it...

Edited on 10/22/2021 at 7:18 AM. Reason:
#6 (permalink)      10/22/2021 7:28:41 AM US Central   quote/reply + tips
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carrion4worm
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Both cord and plug in COULD be your problem, it's a great place to start trouble-shooting, once you know your cells are working fine, which they most likely are.
What does he mean when he says words?
#7 (permalink)      10/22/2021 12:04:13 PM US Central   quote/reply + tips
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zarck
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My Nitecore d2, I think it was called failed in a similar manner. Charging one cell was fine, but two failed. Not sure if this was initially caused by a faulty cell as one of my LG HG2 pair failed at the same time, or if it was the other way around.

And you really do not want something that is faulty charging your potentially dangerous cells. So get a new charger.

Also, most cells are not meant to be charged above 1.25A even though they are able to take up to 4A... I myself wouldn't charge above 1A without fire protection. I rather just have a couple of pairs more and charge at a slower rate, it also improves the life time of the cell.
#8 (permalink)      10/22/2021 1:11:34 PM US Central   quote/reply + tips
RattyRat
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So I tried test it with other cable and plug... and after more than a week of suffering the fucker now works flawlessly, every goddamn function... I'll get him next time :)
Other than that thanks for the tip zarck 1A is fast enough for me... the 200-300mA was torture tho :D
Have you guys any other tip about improving the lifetime of a cell.... for example I usually change them when a mod shows it's on 50%... is it okay or should i use it till the mod let me?
thanks again the answers!
One last question! so if the problem appears again and it is because the charger is faulty could you recommend me a new 2-slot charger... honestly I would buy this one again... It has good specs and good reviews everywhere.... so do you know any better, more reliable charger?

Edited on 10/22/2021 at 2:08 PM. Reason:
#9 (permalink)      10/22/2021 8:42:32 PM US Central   quote/reply + tips
MitchL
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I like the Litokalla 500 for 18650 batteries mostly because it was inexpensive, and I was able to test cell capacities. It will not work for cells larger than 26650. It is a bit hard to remove batteries because of it small stature, and It's maximum charging current is only 1000 mA. It has been reliable after many years of continuous use. I would purchase more batteries for rotation, and test capacity of questionable new cells as well as old ones. Charging at lower mA will extend battery life, and it is very important to keep pairs of identical batteries used in dual battery mods married from beginning to end, as well as only using them as a paired set.

Edited on 10/23/2021 at 2:10 PM. Reason: Changed mah to mA
#10 (permalink)      10/22/2021 8:42:34 PM US Central   quote/reply + tips
MitchL
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Note: When I took a Lii 500 charger to work to charge 18650 head lamp batteries, the USB output for charging phones stopped working, but I have no idea what people plugged into it. It was always full of charging batteries. I used it to NOR test one of my friends 5000mah 50A labled 18650 batteries, and it showed it had under 300mah total capacity!

Edited on 10/22/2021 at 9:10 PM. Reason:
#11 (permalink)      10/22/2021 9:13:21 PM US Central   quote/reply + tips
MitchL
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Note: There are both European and US versions.