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HomeAircraftHelicopterHelicopter Main Discussion › Fully charged lipos in cold weather...What's the risk?
10-25-2013 07:19 PM  5 years agoPost 1
McKrackin

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Lucasville,Ohio

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My PL6 goes into cold weather charge mode when the ambient temperature drops below 50°

It will not charge beyond 93%...4.1V per cell.

I can lower the temperature threshold in the charger but this is obviously a safety feature.

So what is the risk?

I literally never use the word literally right.

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10-25-2013 07:22 PM  5 years agoPost 2
unclejane

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santa fe, NM, USA

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In my experience, there's no risk; you just end up sitting there forever and ever waiting for the frozen batt to get up to 4.20v per cell lol....

I just wrap my hands around em when they stall like that to warm them up. Pockets, batt, pockets, batt etc... they eventually come up.

But yeah probably faster to just stop at 4.10 and take a minute or two off the timer when you go fly...

LS

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10-25-2013 07:32 PM  5 years agoPost 3
McKrackin

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Lucasville,Ohio

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I'm only using 3600mA of my 5000mA packs so it's really no big deal.
So my regular flight time starting at 93% would leave the packs with a little over 20% remaining.

Just curious.

I literally never use the word literally right.

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10-25-2013 07:59 PM  5 years agoPost 4
michael88997

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Lewisville,Tx

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the only risk I know of is if you charge to 4.2 and don't use them then go to room temp they will be over charged... never experienced it cause I don't field charge but that is what ive read online about lipo care

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10-25-2013 08:15 PM  5 years agoPost 5
McKrackin

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Lucasville,Ohio

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They are room temperature.
They will NEVER be in the house.

I literally never use the word literally right.

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10-25-2013 08:22 PM  5 years agoPost 6
michael88997

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Lewisville,Tx

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ah ok, well you shouldn't have to worry about temp changes then.. maybe hook up a hair dryer to your charger so it thinks its hot outside lol

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10-25-2013 08:28 PM  5 years agoPost 7
Glenn Goodlett

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California

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I have read that charging a cold lipo to 4.2 can damage the cell, which is why your charger switches to a different mode.

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10-25-2013 09:38 PM  5 years agoPost 8
wrongler

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Brewerton, New York

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I have put my lipos in the freezer at our club for several minutes and taken them out and charge them with no problems. It's been a few years. They were never frozen.

Bill Whittaker

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10-25-2013 11:44 PM  5 years agoPost 9
fenderstrat

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Aston,Pa

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I spoke with FMA directly about this.as said earlier if you charge a battery that is below 50 or so degrees and bring it inside a house or car and it gets to room temp it will "self charge" and over charge itself.Fully charging a lipo at room temp and going outside is fine.It was also explained like this.If you are inside and fill a ballon till one more air molecule will pop it,and go outside (where its colder)all is good.if its 40 deg outside and you fill the balloon till absolute capacity then
go inside where is 75 it will pop

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10-25-2013 11:45 PM  5 years agoPost 10
McKrackin

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Lucasville,Ohio

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Thanks but that is non-applicable here.lol...

I literally never use the word literally right.

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10-28-2013 03:41 PM  5 years agoPost 11
bloftin

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Midland, TX

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I believe the risk would be charging a cold lipo to 4.2v per cell, then moving the lipo into a warm atmosphere allowing the cell temperature increases on a fully charged battery. Warming a lipo will increase its voltage and of course anything above 4.2v is "overcharged" and could cause some degree of damage to the cell.

If you charge the battery to 4.2v per cell in a cold atmosphere just make sure you fly / discharge them before moving them indoors or a warm vehicle.

ΜΟΛΩΝ ΛΑΒΕ

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10-28-2013 03:45 PM  5 years agoPost 12
McKrackin

rrProfessor

Lucasville,Ohio

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I charge in the garage where it's cold then take them outside where it's colder to fly.

I literally never use the word literally right.

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10-29-2013 03:36 AM  5 years agoPost 13
ICUR1-2

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Ottawa, Ontario

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seeing as how you don't store them fully charged it wouldn't matter bringing them home.

once they're charged I suspect you're going to use them right away so it doesn't matter much where you charge em as long they don't get frozen for long periods.

spending time, paying attention

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10-29-2013 05:49 AM  5 years agoPost 14
jcrack_corn

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End of Time

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lol

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do it inverted
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10-30-2013 02:25 PM  5 years agoPost 15
fenderstrat

rrProfessor

Aston,Pa

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the gibberish was an anology to show this..if a battery is charged at 40 deg to full and brought into a house that is 68 deg it will overcharge itself....just like a balloon under the same conditions will over expand itself and pop.so the increase in temperature causes damage to both items.(the capacity is increased while the maximum allowed remains the same).seems a pretty clear correlation to me

if this condition is not something to worry about why do good chargers have this built in as default.

do some research a lipo will most definately continue to charge itself(proper term?) under those conditions

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10-30-2013 10:24 PM  5 years agoPost 16
jcrack_corn

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End of Time

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lol...thanks for the ignore.

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do it inverted
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10-30-2013 10:27 PM  5 years agoPost 17
jcrack_corn

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End of Time

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lol. thanks for the ignore....

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do it inverted
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10-30-2013 10:28 PM  5 years agoPost 18
McKrackin

rrProfessor

Lucasville,Ohio

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once again, you are just wrong and not understanding what is happening. your analogy is wrong.
Actually,as analogies go,it's a good one and I understand it completely.

You're just being argumentative and way too literal.

Temperature effects them both in very similar ways.

Now take your attitude elsewhere. It's not appreciated here.

I literally never use the word literally right.

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