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01-26-2012 07:43 AM  7 years ago
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myjane

rrApprentice

new zealand

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lipos puffing up
hi i have 4 2.2 amp 11.1 volt turnigy liposthe blue pacs for a 450 i use at home , the batterys have done many flights maby 60 or more each i use the acucell 6 ballance charger and they usuly take about 30 to 40 minuites to charge , the heli has a battery warning on board and i fly all 4 at a time and charge after each session ,question , of late they are starting to get hot and puff up tight after the flight, they cool right down then i charge them again ,is this mean they are on the way out thanks guys
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01-26-2012 07:52 AM  7 years ago
yammx

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Munich, Germany

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Time to throw them if you like to avoid a crash!
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01-26-2012 09:45 AM  7 years ago
Scott4991

rrNovice

Westminster, CO

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Charge balance indications?
how do the batteries balance when charging? You should be seeing a cell or two lower than the others when charging. This is an indication cells are going bad. Do you see this? The puffing is from out-gassing of the cells, I do not think heat is causing this. You are being cautious which is good, but think of replacing these soon.
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01-26-2012 10:30 AM  7 years ago
wrongler

rrProfessor

Brewerton, New York

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They are getting to the point where you may have to replace them, Have you tried shorter flight times?Bill Whittaker
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01-26-2012 04:09 PM  7 years ago
fenderstrat

rrProfessor

Aston,Pa

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how many mah do you normally put in?does your charger give you an IR reading.IR can track battery health over the long haul.lastly how are they performing?Compass helis Support Team
PerformancePlusRC field rep
Mini Titan/SE
TEAM KBDD
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01-26-2012 07:25 PM  7 years ago
Stephen Born

rrElite Veteran

USA

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When is doubt, throw them out.
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01-26-2012 07:35 PM  7 years ago
helibeli

rrApprentice

wales.uk

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They seem to be charging rather too quickly for me.They should be charging at 2.2 amps for an hour roughly.Mine always take this time roughly until the terminal voltage of a cell or two starts to decrease from the initial 4.2 per cell which is an indication they're slowly degrading.I've found you get what you pay for,expensive packs last longer and the cells are better matched to the ideal 4.2 volt fully charged voltage.Don't exceed the 1c charging current.
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01-26-2012 07:47 PM  7 years ago
red_z06

rrProfessor

Dumont, NJ

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Do you know the initial capacity of the pack? Not what is on the pack but actual? If not, go with what is on the label and do slow discharge (1/4-1/2c) to 3.0-3.5v per cell and do slow charge at 1/2c If that number is less than 85% it is usually spent.

After 50 or so cycles, it is a good idea to do cycle test to check the capacity loss and adjust your flight time to 80% accordingly.
www.JustinJee.com
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