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HelicopterMain Discussion › puffed lipo's keeping using or discard
12-20-2015 08:56 PM  24 months agoPost 1
wc_wickedclown (RIP)

rrProfessor

long beach calif

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the ir's are good

Insha Allah made in america

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12-20-2015 09:40 PM  24 months agoPost 2
jason46

rrVeteran

MI

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I continue to use them if they return to normal after they cool, but if the cells are still ballooned up after cooling down, they make me nervous and I cut the connector and give then a salt bath.

I've had cells swell up that had a lower IR than other cells..

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12-20-2015 09:43 PM  24 months agoPost 3
Aaron29

rrProfessor

USA

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If the IR's are good I'd use them. But, in my least favorite models.

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12-20-2015 10:43 PM  24 months agoPost 4
PilotPin

rrApprentice

Indiana -- USA

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For me depends on how tight the wrapping is. If it's still soft when you press your finger on it I still use them. If it's drum tight time for them to go.

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12-20-2015 11:30 PM  24 months agoPost 5
Aaron29

rrProfessor

USA

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I kind of see what you're saying, but have you seen how much expansion it takes for that wrapper to fail? The videos of lipos failing show they are usually 2-3 times the size of original when they let go. The wrapper feeling hard may not be that big a deal.

But at the same time, I see what you are getting at. Just how "puffed" is it? That has to be a consideration. For me, it depends on the size of puff. If it only grew by a few mm, I would likely fly it. If the thing looks plump I would not. And then there are varying degrees in between where it depends on what they are in. I give 2 or 3 cells in a small model a lot more leeway than, say a 10-12s setup. So the impact of one letting go goes into my feelgood/feelbad assessment. I may let my little Trex 450 fly with a puffy battery but my Logo 600 will not.

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12-20-2015 11:32 PM  24 months agoPost 6
gmcullan

rrKey Veteran

Southbridge, MA

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I check the pack balance immediately after a flight. I've had packs that are seriously out of balance but then charge and balance OK. If the pack continues to get out of balance and looses capacity, I take them out of service. As an example, if I land after a 4 minute flight and two cells are at 35% and one is at 14%, I balance charge at 1C and then check the capacity. If the calculated capacity is appreciably lower, i.e., 98% and now 92%, I take the pack out of service. I slow discharge the pack with a 100 ohm 25 watt power resistor. I'll dispose of the pack when it gets to 0 volts.

Gerry Cullan,
Gaui 200, 255; T-Rex 250, 450 SE & SA, Mini-Titan, Blade 450

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12-21-2015 01:58 AM  24 months agoPost 7
Heli Fanatix

rrVeteran

Fountain Valley, CA

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+1 on the slow discharge with a resistor, more effective than a salt solution. On the salt water bath, corrosion would occur before pack goes to a safe level

T,
I suggest using that puffed pack for test hovers or bench test for your builds if you can't bare to put the pack out of service.

FYI
I use my bad packs to power my music, iPad, charge my RX packs and cell phone at the field. LOL

- Scott

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12-21-2015 05:39 AM  24 months agoPost 8
grim.the.grim

rrVeteran

Houston, Texas

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+1
I suggest using that puffed pack for test hovers or bench test for your builds if you can't bare to put the pack out of service.

FYI
I use my bad packs to power my music, iPad, charge my RX packs and cell phone at the field.
I also use them for my field starter!

*** Real Pilots BEAT the air into submission! ***

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12-21-2015 05:46 AM  24 months agoPost 9
Aaron29

rrProfessor

USA

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How do you charge phones and ipads?

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12-21-2015 07:04 AM  24 months agoPost 10
Heli Fanatix

rrVeteran

Fountain Valley, CA

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This is what I use to charge my phones and ipads

https://www.hobbyking.com/hobbyking...idProduct=46361

BTW
When you use a lipo for your starter on a bigger motors that requires globs of torque and if you flood the motor and lock up the starter. Will not be a good thing for the lipo. For this reason, I use the old school nicad.

- Scott

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HelicopterMain Discussion › puffed lipo's keeping using or discard
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