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› Batteries not fully charging
10-13-2012 04:00 PM  6 years agoPost 1
HeliNutAndy

rrKey Veteran

worcester, MA USA

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Hello,

I have some new 6S 22.2V 5000 MAH batteries. When I balance charge them at 20 amps 2 batteries do not fully charge or the charger does not recognize them as being fully charged and they will continue to charge until I stop the charging cycle. I am using a Turnigy 400w charger that when I start the cycle the charger states the amp setting is 20 amps and it will go down to about .3 amps after a half hour or so. The batteries seem to work fine. Is it my charger that is acting screwy or is it my batteries? I am hoping it's not the batteries because they actually cost more than the charger s it some setting within the charger itself that determines when to stop?

TIA,
Andy

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10-13-2012 04:50 PM  6 years agoPost 2
rexxigpilot

rrProfessor

Florida

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Borrow a high quality charger like the PL8 or 3010B from a friend. If they won't charge the packs fully, you'll know it's the packs.

A word of warning, don't buy cheap charging equipment. You will end up paying more in the long run as you damage packs. Cheap chargers are just not worth buying.

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10-13-2012 06:04 PM  6 years agoPost 3
TheWoodCrafter

rrKey Veteran

Costa Mesa, Ca.

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So they end up staying in the balance mode at the end of the charge cycle and never finish?

How old are the packs, how many cycles do you have on them, what brand are they?

If it is a balancing problem, slow down the rate to about 1 - 1/2c and charge them.If that doesn't straighten them out they may be showing signs of old age.

Thanks, TheWoodCrafter

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10-13-2012 07:08 PM  6 years agoPost 4
HeliNutAndy

rrKey Veteran

worcester, MA USA

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So they end up staying in the balance mode at the end of the charge cycle and never finish?
Yes, it looks like they are still charging and the charger never give me the 'finished' alert.
How old are the packs, how many cycles do you have on them, what brand are they?
The packs are about a month old and only have been used a few times. The are Turnigy 6S 5000MAH that have a maximum 5C charge rate and a 25-45C discharge rate.
Borrow a high quality charger like the PL8 or 3010B from a friend. If they won't charge the packs fully, you'll know it's the packs.
I do not know anyone that flies. I cannot borrow any equipment. I will try charging them at a very low rating .5 or so and see how that goes.

Thank you for your help.

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10-18-2012 02:31 PM  6 years agoPost 5
TheWoodCrafter

rrKey Veteran

Costa Mesa, Ca.

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So how did a slow charge work?

Any improvement?

Thanks, TheWoodCrafter

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10-18-2012 02:50 PM  6 years agoPost 6
HeliNutAndy

rrKey Veteran

worcester, MA USA

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Thank you. The slower charge did work. Since I am running at the high end of my charging equipment(Charging at 20 amps) I think the charger may act a little flaky. It is a Turnigy 400 Watt charger that appears to work well. Thx again.

Andy

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10-18-2012 04:20 PM  6 years agoPost 7
rexxigpilot

rrProfessor

Florida

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It is a Turnigy 400 Watt charger that appears to work well
Actually, you just demonstrated one of the problems with most cheap chargers. They have weak, as in low wattage, balancing circuits. This tends to make charging slower and it will eventually cause damage to your batteries. Why? Because the higher voltage cells (the weaker ones in the pack BTW) will get slightly overcharged every time you recharge.

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10-18-2012 05:50 PM  6 years agoPost 8
HeliNutAndy

rrKey Veteran

worcester, MA USA

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Actually, you just demonstrated one of the problems with most cheap chargers. They have weak, as in low wattage, balancing circuits.
Is this something you know to be fact with this particular charger?

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10-18-2012 06:52 PM  6 years agoPost 9
Gregor99

rrElite Veteran

Western Wa

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Is this something you know to be fact with this particular charger?
Balancing current power on your charger is 200ma.

Spec.
Input voltage: 11.0 – 18.0Volt
Charge current: 0.1 – 20.0A
Discharge current: 0.1 – 5.0A
Maximum charge capacity: 400W @ input voltage >15V
Maximum discharge capacity: 25W
Current drain for balancing Li-po: 200mAh/cell
Lithium (LiPo/LiIo/LiFe) battery cell count: 1 – 6 series
NiCd/NiMH battery cell count: 1 – 18 series
Pb battery voltage: 2 –24V
Battery setup memories: 10
Intelligent temperature control: Yes
Weight: 815g

The iChargers are double that. The Powerlabs are five times that value. Balancing power may not be your only issue. The CV termination current may be too low for the packs you are charging. That's not adjustable on your charger. However it is adjustable the Powerlabs.

When I replied your thread back in September (link below), I was trying prevent you from running into issues like you are having now.

https://rc.runryder.com/t706205p2/

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10-18-2012 07:34 PM  6 years agoPost 10
HeliNutAndy

rrKey Veteran

worcester, MA USA

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Thank you for the help and concern. I charged the packs at 1C and I have not had the issue anymore. I think charging the packs at 1C every once in a while will also be good for the packs.
The iChargers are double that. The Powerlabs are five times that value.
I am very happy with what I have. The chargers you mention are also much more expensive. I can afford it but as I mentioned previously charges and batteries do not get me excited and it's just not worth it to me.

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10-19-2012 12:18 AM  6 years agoPost 11
rexxigpilot

rrProfessor

Florida

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I can afford it but as I mentioned previously charges and batteries do not get me excited and it's just not worth it to me.
If you used large packs that cost around $100 each or more and your cheap charger destroyed them, trust me, you would get very excited!

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10-19-2012 01:36 AM  6 years agoPost 12
HeliNutAndy

rrKey Veteran

worcester, MA USA

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I do not know where all of this angst is coming from. I've attempted to be polite as possible but that doesn't seem to matter here(Yes, keeping rolling those eyes). The charger hasn't destroyed any of my batteries and I was looking for maybe a little help and god forbid some encouragement.
When I replied your thread back in September (link below), I was trying prevent you from running into issues like you are having now.
Just because I asked for an opinion on a subject doesn't mean I'm obligated to take the advice. I do not have the best helicopters or charging equipment but I am more than happy with what I have.

Thank you WoodCrafter for the genuine help.

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10-19-2012 01:43 AM  6 years agoPost 13
Flaco2317

rrNovice

USA Georgia

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A good charger and power supply are worth their weight in gold. While most chargers look about the same from the outside the differences under the cover is night and day. Quite simply you get what you pay for.

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10-19-2012 02:30 AM  6 years agoPost 14
TheWoodCrafter

rrKey Veteran

Costa Mesa, Ca.

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Your welcome Andy.

Don't let any of this discourage you from asking questions.

Thanks, TheWoodCrafter

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10-19-2012 03:54 AM  6 years agoPost 15
Gregor99

rrElite Veteran

Western Wa

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Don't let any of this discourage you from asking questions.
+1

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10-19-2012 04:00 AM  6 years agoPost 16
Gregor99

rrElite Veteran

Western Wa

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Just because I asked for an opinion on a subject doesn't mean I'm obligated to take the advice.
True. But just because you don't take advice and then have issues, I'm not obligated to remain quiet about connection between choices and consequences. Even though to do so would be more polite, it would be actually be less honest. A true friend is not afraid to speak the truth.

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10-19-2012 04:07 AM  6 years agoPost 17
Ace Dude

rrProfessor

USA

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True. But just because you don't take advice and then have issues, I'm not obligated to remain quiet about connection between choices and consequences. Even though to do so would be more polite, it would be actually be less honest. A true friend is not afraid to speak the truth.
+1!

  

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