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HelicopterBeginners Corner › Lipo battery
01-16-2017 12:48 PM  5 months agoPost 1
Thepackerjoe

New Heliman

Perris ca usa

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Hi I have several small helicopters for the past 3 years I haven't been able to play. But things have sorted themselves out. So I'm unpacking my stuff. I have a lipo battery that is really puffy. Is it safe to use ?

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01-16-2017 12:52 PM  5 months agoPost 2
Dan Minick

Key Veteran

Columbus, WI

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I would not use it. Its probably pretty cheap to replace compared to the damage it could cause if it fails in flight, or starts a fire.

Team Synergy, Team FBL Rotors---Formerly Dyecocker1-------if its not broke...it will be!

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01-16-2017 03:26 PM  5 months agoPost 3
Heli_Splatter

Elite Veteran

Silver Spring, MD by way of Sidney, Ne - USA

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Yes, you can use it. Would I use it on an expensive aircraft? No

I have been a master at using old puffed batteries. Do not over fly them. Keep track of the flight time. It is hard to throw away an expensive battery. Even the small ones add up.

I keep batteries in ammo boxes. I only charge while I am present. I do not push my charge rates. I keep track of how much I am putting into the battery. I am checking cell voltage differences. If I cannot balance them, I throw them away. It is hard to throw away 5 cells of good battery when only one cell is bad. I balance charge each and every time that I charge.

I also do not fly really hard 3D. This would not work. You cannot expect optimal performance.

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02-01-2017 12:47 PM  4 months agoPost 4
allns47

Key Veteran

Richmond IN.

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Do not use at all....dispose of it...it's not worth it

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03-31-2017 07:28 AM  87 days agoPost 5
joshreynolds777

Senior Heliman

Willis, Tx

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what voltage are the cells reading ?

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04-24-2017 09:34 AM  63 days agoPost 6
betty

New Heliman

Shenzhen

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Yes, it depends on. But you'd better not use it again.

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04-29-2017 12:52 PM  58 days agoPost 7
Heli_Splatter

Elite Veteran

Silver Spring, MD by way of Sidney, Ne - USA

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You can listen to these guys and buy batteries like candy or you can use what you already own. Why not get a few more cycles out of a battery? I sure would not fly them hard, but some gentle flight or hover practice would be perfect.

If they deliver power use them. They puff by getting hot. So take care in charging, storing and using this type of battery. Keep the temp down.

This is first hand advice... I do it, and it works. keep your eye on them. Measure the Internal Resistance (IR) and monitor the mAhr in and flight times.

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04-29-2017 02:53 PM  58 days agoPost 8
jhhyah

Senior Heliman

Taipei, Taiwan

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Just a different opinion, normally, a new battery is the most dangerous compared to a used battery, FYI.
Let's think about the case of famous Samsun S7,The poor cell design or manufacturing defect will cause damage at very early stage.
So, you should take extra care on your new battery pack.

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04-29-2017 03:02 PM  58 days agoPost 9
Heli_Splatter

Elite Veteran

Silver Spring, MD by way of Sidney, Ne - USA

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Not the Samsung S7... Galaxy NoteS7... there is a difference.

I have an S7 on the desk in front of me at this moment.

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04-29-2017 03:19 PM  58 days agoPost 10
jhhyah

Senior Heliman

Taipei, Taiwan

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"Not the Samsung S7... Galaxy NoteS7... there is a difference.
""
I guess you are right. I am not a Samsung cellphone user.

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04-29-2017 06:43 PM  57 days agoPost 11
Heli_Splatter

Elite Veteran

Silver Spring, MD by way of Sidney, Ne - USA

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The S7 is really a pretty good phone... glad I have mine.

About the puffed lipos... yeah I know it is not the greatest decision, but I tell you, it is not as bad as some will tell you. They make a voltage checker with an alarm that is rather inexpensive that beeps when you reach the set voltage. Maybe try one of those to monitor your battery in flight.

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04-30-2017 09:57 AM  57 days agoPost 12
joshreynolds777

Senior Heliman

Willis, Tx

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agree with heli splatter here.
I use those little volt meter alarms all the time, especially with new models and (new for me but old) lipos

They're super cheap.
But order a few because sometimes you'll get some that aren't very accurate at all.
You'll need to weed thru and toss the faulty ones.

I dont have any more puffy lipos. But yah, If they're holding charge ok, and balancing, and sells aren't straying too far off from each other use that puppy.

As soon as you start seeing too much irregularity in the cells is usually when I either down size the pack to something smaller.
or chop off the connectors, soak it in salt water and dispose of it.

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04-30-2017 10:45 AM  57 days agoPost 13
jhhyah

Senior Heliman

Taipei, Taiwan

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""soak it in salt water and dispose of it.""
Interesting, would like to know why ?

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04-30-2017 10:58 AM  57 days agoPost 14
joshreynolds777

Senior Heliman

Willis, Tx

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drops the voltage out of it so you can safely dispose

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04-30-2017 11:06 AM  57 days agoPost 15
joshreynolds777

Senior Heliman

Willis, Tx

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the salt neutralizes the lithium. takes a week or so. takes the volts down to 0.0v per cell. Then it can be properly disposed of without risk of fire

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04-30-2017 11:17 AM  57 days agoPost 16
jhhyah

Senior Heliman

Taipei, Taiwan

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Thanks, understand.
I did it with a resist to discharge the pack to 0 volt , take about 1 hour(from 3.4 to 0)

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04-30-2017 07:28 PM  56 days agoPost 17
Heli_Splatter

Elite Veteran

Silver Spring, MD by way of Sidney, Ne - USA

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I cut a slit in the foil package of each cell before the dip in water. Does not have to be salt water. Then they are safe to dispose. Overnight

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