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HelicopterMain Discussion › Transmitter Li-po Pack
03-17-2009 07:32 PM  8 years agoPost 41
tom dubya

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st.louis

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I ruined 3 batteries leaving them fully charged
How long did you leave them?
A few months, but i think the rule of thumb is discharge to 50% if unused for longer than a few weeks to a month or more. But someone could correct me on that accuracy.

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03-17-2009 08:39 PM  8 years agoPost 42
longhair

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Beaver Falls, PA

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I think 3.85v per cell is where you want to be for storage. That is what I kept finding when I was looking into what to do for winter.

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03-17-2009 08:49 PM  8 years agoPost 43
Zaneman007

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Texas - USA

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I have to say, I have the lipo in my Tx unused for at least a month or maybe more. And I'm still using it today. It works just fine. But, I have a diode in line with the TX, and that may have prevented it from discharging.

I left a lipo plugged into a Trex 450. The ESC(Quark 33a) has an on/off switch. It was turned off. After two weeks the lipo was useless.

On storage, I have had fully charged 11.1v 3s1p packs sit unused for months on end. They all work fine, still.

Old Guys Rule!

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03-17-2009 09:21 PM  8 years agoPost 44
Jacoub

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Kuwait

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Saint728 +1

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03-17-2009 09:27 PM  8 years agoPost 45
lightningrc

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UK

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Whether used much or not from the first use theres a chemical reaction in lipo batteries , they degrade with out use .

But from what I have been told it happens faster from high use.

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03-17-2009 09:31 PM  8 years agoPost 46
Skarn

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Pasadena, MD

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There is nothing wrong with keeping a lipo fully charged for long term storage if you place them in the freezer.

Here is a link directly from the Kong Power website where they specifically recommend putting fully charged lipo's in the freezer.

http://www.kongpower.com/faq_en/sho...Txt01=&srhTxt02

I've been doing this for about 2 years now without any issues. I love how these "rumors" start....

I've even left them fully charged for over 6 months at room temp and they were fine. I have no idea why someone "ruined 3 lipo's by keeping them fully charged..." I personally don't buy it.

But if I KNOW I won't be flying for quite some time, I charge to 3.8 per cell and leave at room temp. The problem is that I never seem to know when I'll be able to fly again so I charge fully immediately after flying most of the time.

Skarn

It's better to burn out than to fade away...

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03-17-2009 09:34 PM  8 years agoPost 47
lightningrc

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UK

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Probably putting them in the freezer stops the chemical reaction while the liquid is frozen

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03-18-2009 01:01 AM  8 years agoPost 48
tom dubya

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st.louis

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I've even left them fully charged for over 6 months at room temp and they were fine. I have no idea why someone "ruined 3 lipo's by keeping them fully charged..." I personally don't buy it.
Sorry you don't believe me but thats what happened. Last i used them they all worked fine and then they sat for months and not one of them worked, all at the same time.
And i should add that these were cheap lipos, two were esky and one was a mystery.

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03-18-2009 03:53 PM  8 years agoPost 49
Skarn

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Pasadena, MD

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Sorry you don't believe me but thats what happened. Last i used them they all worked fine and then they sat for months and not one of them worked, all at the same time.
And i should add that these were cheap lipos, two were esky and one was a mystery.
Sorry bro, I didn't mean to imply you were making it up...I should have worded it better.

What I meant was that I suspect maybe something else caused them to die like that....and now you did say they were cheapo batteries.

My apologies.

Skarn

It's better to burn out than to fade away...

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03-18-2009 05:47 PM  8 years agoPost 50
TOSH

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UK.Peterborough

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What is the fully charged voltage of your 3C 11.1Volt lipo?
Just chagred mine. lt went to 12.6V

Flybars. Who needs `em.

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03-18-2009 06:39 PM  8 years agoPost 51
RC.

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Bay Area Ca.

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I do, I just uplug it. Zippy batteries ftw!

RC.
MI Flyers.

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03-18-2009 06:44 PM  8 years agoPost 52
longhair

rrApprentice

Beaver Falls, PA

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[quote]There is nothing wrong with keeping a lipo fully charged for long term storage if you place them in the freezer.

Here is a link directly from the Kong Power website where they specifically recommend putting fully charged lipo's in the freezer.

http://www.kongpower.com/faq_en/sho...Txt01=&srhTxt02

I've been doing this for about 2 years now without any issues. I love how these "rumors" start....

I've even left them fully charged for over 6 months at room temp and they were fine. I have no idea why someone "ruined 3 lipo's by keeping them fully charged..." I personally don't buy it.

But if I KNOW I won't be flying for quite some time, I charge to 3.8 per cell and leave at room temp. The problem is that I never seem to know when I'll be able to fly again so I charge fully immediately after flying most of the time.
I personally run mine through the storage charge feature on my charger and put them in the fridge. The lower temps of the fridge and especially will greatly slow down the chemical reaction in the battery.

If you find something that works for you, then stick with it unless you find something that works better.

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03-18-2009 07:07 PM  8 years agoPost 53
tom dubya

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st.louis

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No offense taken Skarn. And i am by no means a guru when it comes to battery talk. But are you saying that storing a fully charged battery should be okay. Honestly before this happened to me i didn't even know that it would be an issue. But after my lipo hibernation when i tryed to fly and all three of the batteries were dead it seemed really odd to me. So I went online and started reading about properly storing batteries and then what happened made sense. Maybe it was just the fact that they were cheaper lipos i guess.

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