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HomeAircraftHelicopterRadio - Servo - Gyro - Gov - Batt › Puffy battery not puffy anymore?
03-06-2008 04:44 AM  10 years agoPost 1
Dave_E

rrApprentice

Stanwood, WA

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Hi All,

So I had these 2100 15C and a 20C batteries, both of which started to puff at about 60 cycles. Then continued to stay puffy to the point where I just did not feel safe using and charging them. So the 15C was on my bench to have the connector taken off and I forgot about it for well over a month. It's no longer puffy, so I charged it and today flew it for 5 minutes, yea it got warm as usual, had 3.8V per cell when I was done, but it didn't puff! What's up?

Dave

CHECK 6

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03-06-2008 04:50 AM  10 years agoPost 2
Zaneman007

rrElite Veteran

Texas - USA

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If you poke a hole in a ballon it will deflate. The gas in the battery just found a hole and got out.

Old Guys Rule!

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03-07-2008 01:27 AM  10 years agoPost 3
TankDirt

rrKey Veteran

Illinois

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if the gas in the batt found a hole,you wouldnt have a work bench anymore...

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03-07-2008 02:08 AM  10 years agoPost 4
rexxigpilot

rrProfessor

Florida

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True. The gas got absorbed by the battery's internal chemistry. You may not have a problem with puffing again, but don't be surprised if the capacity of the battery is significantly diminished. I have many batteries that did just as yours did. Use them till there is about 70-75% of original capacity, then discard 'em. It is my understanding that over discharging and over charging a lipo not only causes puffing but creates minute shorts in the battery. This can dramtically increase the battery's internal resistance. When severe enough, it will create a dangerous condition and the battery should be properly disposed.

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03-09-2008 12:44 AM  10 years agoPost 5
Dave_E

rrApprentice

Stanwood, WA

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Thanks guys,

That's exactly what happened... no life. Even though it say's 3.81V or so per cell and charged, I get about 3 minutes if that. Toast!

Dave

CHECK 6

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HomeAircraftHelicopterRadio - Servo - Gyro - Gov - Batt › Puffy battery not puffy anymore?
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