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Old Jul 09, 2012, 03:57 PM
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Charleston, SC
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first time charge 2200 30c 4s

Question...

My first charge on a new lipo using my iCharger 106b resulted in a total charge of 16.85 volts, which my meter read as "overcharged".

I was charging three 2200 30c 4s lipos at 6.6volts.

What is the max volts for this Lipo.

I used auto settings, which correctly detected the cell count and 14.8v

Any thoughts would be appreciated.
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Old Jul 09, 2012, 04:06 PM
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What meter are you using and have you established that it is more accurate than your charger? e.g. - Has the meter been calibrated against a known voltage reference?

Mark
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Old Jul 09, 2012, 04:39 PM
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United States, MN
Joined Feb 2011
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Quote:
Originally Posted by Raehm View Post
Question...

My first charge on a new lipo using my iCharger 106b resulted in a total charge of 16.85 volts, which my meter read as "overcharged".

I was charging three 2200 30c 4s lipos at 6.6volts.

What is the max volts for this Lipo.

I used auto settings, which correctly detected the cell count and 14.8v

Any thoughts would be appreciated.
A full charge for any lipo is 4.2V x cell count. So for a 4S it's 16.8V which isn't too far off from the 16.85V you said your meter reads. Chances are pretty good your meter is not reading correct. Depending how your meter reads and rounds numbers if it's not calibrated right a little bit off on each cell value could add up fast.
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Old Jul 09, 2012, 04:47 PM
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Joined Feb 2007
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I don't see the problem.
I assume you mean 6.6A ( not 6.6V) as you are charging 3 x 2200 packs, presumably in parallel.
For 4S pack the finishing voltage should be 16.80 so 16.85 is OK. The meter can easily be that far out as it is only 0.05% error on a full scale basis and the charger readout would probably not be that accurate

Mark - did you read it as a 3S pack?

Wayne
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Old Jul 09, 2012, 04:53 PM
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No, I read it as a 4S pack and the user was concerned about the minuscule .05V 'overcharge'. Where I was heading is that it is simple measurement error.

Mark
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Old Jul 10, 2012, 08:42 AM
fast,,,, faster
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i had started a new post so now this is my findings
http://www.rcgroups.com/forums/showthread.php?t=1686670
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Old Jul 10, 2012, 10:49 AM
VOLTS > AMPS
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Joined Jul 2011
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I asked this once before and I can't find it again. For lead batteries what is a safe charge rate? Is it amp hours/4. Grandpa got the kids a power wheels and the wall wart charger take 13 hours to charge it. Figured the I charger could do it in less.

The wall wart is rated at 13 watts for 12 volts.
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Old Jul 10, 2012, 02:59 PM
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Quote:
Originally Posted by stgdz View Post
I asked this once before and I can't find it again. For lead batteries what is a safe charge rate? Is it amp hours/4. Grandpa got the kids a power wheels and the wall wart charger take 13 hours to charge it. Figured the I charger could do it in less.

The wall wart is rated at 13 watts for 12 volts.
Based on this article sounds like C/3 is doable as long as you are sure it won't over charge:
http://www.powerstream.com/SLA-fast-charge.htm

The iCharger manual though says no more then 0.4C.
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Old Jul 10, 2012, 03:19 PM
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Charleston, SC
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Quote:
Originally Posted by grimbeaver View Post
A full charge for any lipo is 4.2V x cell count. So for a 4S it's 16.8V which isn't too far off from the 16.85V you said your meter reads. Chances are pretty good your meter is not reading correct. Depending how your meter reads and rounds numbers if it's not calibrated right a little bit off on each cell value could add up fast.
Got it. Thanks!
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Old Jul 11, 2012, 07:29 AM
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Hello, I have an iCharger 3010b and I accidentally plugged the lipo reversed and I started charging. The cb has smoked even though in theory there is protection against polarity reversal, the component went up in smoke you can see it here

is a mosfet of the international rectifier, this https://ec.irf.com/v6/en/US/adirect/...D=IRFB3306GPBF.
question for Junsi: why the polarity protection did not work?
Thanks to all for your responses
Matteo

ps. i bought it from hobbyking
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Old Jul 11, 2012, 03:45 PM
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The reverse polarity check alarm didn't go off?
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Old Jul 11, 2012, 04:00 PM
Too much is just not enough...
Woody_99's Avatar
Joined Jan 2009
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Quote:
Originally Posted by N6145k View Post
The reverse polarity check alarm didn't go off?
Looks like it was a visual indicator in this case. (smoke signal)

Sorry, couldn't help myself.
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Old Jul 11, 2012, 06:43 PM
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Italy, Piemonte, Casale Monferrato
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Quote:
Originally Posted by N6145k View Post
The reverse polarity check alarm didn't go off?
the charge started like always without any alarm, a lot of smoke and smell came out from cb, i turned off the cb immediatly and i seen the reversed polarity
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Old Jul 11, 2012, 08:49 PM
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Joined Mar 2007
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Quote:
Originally Posted by dea90 View Post
Hello, I have an iCharger 3010b and I accidentally plugged the lipo reversed and I started charging. The cb has smoked even though in theory there is protection against polarity reversal, the component went up in smoke you can see it here
is a mosfet of the international rectifier, this https://ec.irf.com/v6/en/US/adirect/...D=IRFB3306GPBF.
question for Junsi: why the polarity protection did not work?
Thanks to all for your responses
Matteo

ps. i bought it from hobbyking
Hello Matteo,

We are really sorry to cause you this trouble, our engineers have figured out that the problem was caused by our faulty design, and we had revised this problem already in the new batches.

As for 306B and 3010B in the previous batches, we need remind All Junsi Valued Customers to pay attention that: the polarity reversal protection function will fail to work if you first plug the reversed batteries then power on the charger, but the protection still works if you had powered on the charger then plug the batteries with reversed polarity.

Sorry again for this trouble made, we have sent you a PM about sending the charger back to us for repairing, thanks for your understanding and cooperation.

BR
Junsi
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Old Jul 11, 2012, 10:38 PM
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Australia, SA, Adelaide
Joined May 2011
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I have beening thinking about getting the 206B and P350 for a while. Junsi's handling of the situation above gives me confidence in their customer support if I need it. I will order them tomorrow, I was going to buy them from Progressive RC are any other supplers I should look at before buying?
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