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› How far out of balance is tolerable with a new pack?
04-30-2010 02:47 PM  8 years agoPost 1
Richardmid1

rrProfessor

Leeds, England

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I have just received 2 Zippy Flightmax 6s 5000mah 30C packs and both had the exact same 2 cells out of balance by the same amount, cells 5 and 6 were 0.06v lower than the rest on both packs! Both charged ok but cells 5 and 6 only went to 4.19v and the rest went to the usual 4.20v.

I know from experience that these packs will always be out of balance and performance and life span will suffer as a result.

Should I send them back to Hong Kong? If I do do I run the risk of the replacements being even further out of balance or do you think they will check them to make sure I get a perectly balance pack?

60% of the time, it works every time!

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04-30-2010 04:12 PM  8 years agoPost 2
nivlek

rrProfessor

Norfolk England

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I would say that's normal .
I've just got a Turnigy 6S 3000 20C pack and before charging , the cells were reading between 3.78V and 3.88V .
I'm just going to balance them on my 'V' balancer before balance charging .
I bought four Flightmax 2200 3S 25C packs a year ago , they were about the same balance wise when they arrived and they still work fine .

What did you measure the voltages with ? If you are using the internal voltage meter on your charger , there is no way that it is 100% accurate . The difference between 4.2 and 4.19 is only about 0.2%
and you have to pay quite a bit to get Volt meters that accurate .
You really need to measure the individual cells with a digital volt meter , that way you can see if there really is any discrepancy as you are measuring them all with the same instrument . Even if the meter isn't accurate , the discrepancy will be the same on all of the cells .
Just be careful not to short anything out while your checking them !

At the end of the day , it gets dark .

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04-30-2010 06:03 PM  8 years agoPost 3
Dr.Ben

rrMaster

Richmond, VA, USA

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Don't sweat it. I think 50% of 8 total "Kung Foo" 6S packs I own displayed/display a 0.01 V variance in at least a cell or two. I suppose an ultrapremium pack might do better, but maybe not.

Ben Minor

Peak Aircraft/Team Minicopter Team Futaba Team Kontronik USA

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05-01-2010 10:12 AM  8 years agoPost 4
Richardmid1

rrProfessor

Leeds, England

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I was going by what it says on the charger, all my other none Hong Kong packs balance perfectly with the exception of one flightpower pack I bought new that had one cell out of balance, again I bought 2 of these flightpower packs new, one balanced perfectly and the other had one cell about 0.1v less than the rest, I could tell the difference in performance between those 2 packs. If the chargers aren't accurate to 0.01v, why does the display go to 2 decimal places? They cant just be random numbers can they?

60% of the time, it works every time!

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05-01-2010 04:08 PM  8 years agoPost 5
nivlek

rrProfessor

Norfolk England

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If the chargers aren't accurate to 0.01v, why does the display go to 2 decimal places? They cant just be random numbers can they?
They are not random , but unlikely to be perfectly accurate .
Take a look at the specs of a typical decent brand of multimeter .

http://us.fluke.com/fluke/usen/Digi...4.htm?PID=55992

Look at the accuracy of the meter on DC voltage , 0.5% + 2 counts . Even ignoring the 2 counts , 0.5% of 4.2V is 0.021V .

At the end of the day , it gets dark .

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05-01-2010 04:14 PM  8 years agoPost 6
nivlek

rrProfessor

Norfolk England

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This one is better :
http://www.powermeterstore.com/p1355/fluke_77-iv.php

Accuracy of 0.3% , but it probably costs as much as your charger .

At the end of the day , it gets dark .

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05-01-2010 04:31 PM  8 years agoPost 7
Wingman77

rrProfessor

Pulaski Tennessee

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I have just received 2 Zippy Flightmax 6s 5000mah 30C packs and both had the exact same 2 cells out of balance by the same amount, cells 5 and 6 were 0.06v lower than the rest on both packs! Both charged ok but cells 5 and 6 only went to 4.19v and the rest went to the usual 4.20v.
that is perfectly normal, no worries

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05-02-2010 05:02 PM  8 years agoPost 8
Tag1260

rrApprentice

Ohio USA

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How far OVER 4.2v do you trust. I have a charger that will balance at 4.24v to 4.26v. Is it actually over-charging too much?

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05-02-2010 07:34 PM  8 years agoPost 9
Dr.Ben

rrMaster

Richmond, VA, USA

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THAT would be concerning to me. My iChargers never push the pack voltage over indicated 4.2V.

Ben Minor

Peak Aircraft/Team Minicopter Team Futaba Team Kontronik USA

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05-02-2010 09:19 PM  8 years agoPost 10
Wingman77

rrProfessor

Pulaski Tennessee

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you will not have major issues if you stay under 4.3v and from my testing they will not burn untill they are about 4.5v

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05-07-2010 08:06 AM  8 years agoPost 11
naked painter

rrVeteran

Mid glamorgan uk

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My flightpowers were way out and they lasted around 50 cycles..

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05-07-2010 05:54 PM  8 years agoPost 12
dxflyer

rrApprentice

Bay area, California

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My 6s HK batteries were out of balance for several cycles; then eventually all balanced out after about 5 cycles. I did break them in too.

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