The cold !

[crazee horse]

Is it possible the freezing tempature could be have a detrimental effect on my esc ? I'm currently running an ezrun wp sc8 on 2s my batteries are also dying pretty quickly compared to normal. Is there a bullet/water proof esc or do they all die within 6 months ? Nothing seems to be able to take a good mudding !

[xCoolHandLukex]

I don't know about your esc but extreme cold will for sure make your batteries weaker


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[Natedog]

Colder is usually better for esc, lowers the internal resistance...should not adversely affect it.

Batteries don't like to be cold (or too hot, but that shouldn't be a problem in UK), they will put out less and sometimes a charge doesn't seem to last quite as long, but I've never had this problem with lipos in cold temps. Even running at 8000 feet elevation in the snow and wind has not been a problem.

How cold is cold for you?

[patman_and_robin]

I usually lose 1/4 to 1/3 of the run time I normally would when it gets cold.

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[crazee horse]

Originally Posted by Natedog

Colder is usually better for esc, lowers the internal resistance...should not adversely affect it.

Batteries don't like to be cold (or too hot, but that shouldn't be a problem in UK), they will put out less and sometimes a charge doesn't seem to last quite as long, but I've never had this problem with lipos in cold temps. Even running at 8000 feet elevation in the snow and wind has not been a problem.

How cold is cold for you?

-2 in real money. Everything frozen solid.

[xCoolHandLukex]

Originally Posted by crazee horse

-2 in real money. Everything frozen solid.

-2 shouldn't be cold enough to affect it much. I just ran my Sunmit in -14 temp and didn't really notice any performance loss at all.


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[Natedog]

Originally Posted by crazee horse

-2 in real money. Everything frozen solid.

-2F? That shouldn't bother it much.

Originally Posted by xCoolHandLukex

-2 shouldn't be cold enough to affect it much. I just ran my Sunmit in -14 temp and didn't really notice any performance loss at all.

[crazee horse]

Correct me if I'm wrong but British and American tempature are totally different. I read something about freezing point was -20 or something ? Here 0 will freeze.

[Rock Farmer]

No matter where your at on globe water always freezes at 32*F, there is a difference in how we look at those #'s, Fahrenheit vs Celsius. Not sure what the conversion is but rest assured water will freeze at 32*F, that may look different using the ole Calvin conversion, but the air/temp is the same!

[xCoolHandLukex]

Water freezes at 0 degrees Celsius so 32F is 0C


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[maslin]

Cold only seems to kill my run time, mostly due to the massive amount of snow piled in the rig. Plastic gets super brittle as well.

I've been tempted to get the Bomber out, but -24F is very uncomfortable.

[Rock Farmer]

Originally Posted by xCoolHandLukex

Water freezes at 0 degrees Celsius so 32F is 0C


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...oops, I knew I should have had that 1st sip of coffee before responding, , plus i switched to Sanka, so have a heart. Lol! Thanks for pointing that out!

[Yeti guy]

Does it RUIN your battery???

[xCoolHandLukex]

Originally Posted by Yeti guy

Does it RUIN your battery???

No as long as you let the battery cool a few minutes after charging before you run it and let it warm back up afterwards before you charge it again. Never charge a really cold or warm battery.


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[TacoCrawler]

Originally Posted by xCoolHandLukex

No as long as you let the battery cool a few minutes after charging before you run it and let it warm back up afterwards before you charge it again. Never charge a really cold or warm battery.


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I charge my LiPos immediately after running them.

They don't become warm when running them.
If they do... there's likely another problem.

Now NiCad or NiMh yeah those can become warm during use.
And should be cooled down before recharging.

-------------

I've never had ambient temp issues degrading my LiPo batteries.

but the colder temps could effect mechanical components...
As extreme cold can cause contraction to most metal components
and extreme heat can cause expansion.

This effect could increase or decrease rolling resistance
and create more drag or resistance for the components and battery.

example

extremely cold bearings and metal components can create more rolling resistance and cause things to run less efficiently,
possibly even reducing run time slightly.

But I'm not so sure a LiPo battery in of itself could be the fault.

[84yoda]

Originally Posted by Yeti guy

Does it RUIN your battery???

Yes.

"The ESR of lipo packs can vary by 30 to 90% for a temperature change of 10⁰ to 30⁰C *(50⁰ to 85⁰F).

(b) Winter Flying

The above demonstrates why it is important to warm your LiPos before use in cold conditions.* If you launch with cold LiPos the voltage and power level is much lower, often to the point where the ESC will shut down on undervoltage.* The current through the LiPo will heat it up (and damage it!), reduce the ESR and the power will gradually rise.* This is why so many LiPos fail in cold weather.* Therefore pre-warm your LiPos in winter."

http://www.smc-racing.net/index.php?...tegory&path=75

Originally Posted by TacoCrawler

I charge my LiPos immediately after running them.

Such a bad idea. Have you ever checked a battery right after lipo cut, then wait 20 minutes and check it again? The volts go up, that's why your supposed to wait then charge.

[xCoolHandLukex]

Originally Posted by TacoCrawler

I charge my LiPos immediately after running them.

They don't become warm when running them.
If they do... there's likely another problem.

Now NiCad or NiMh yeah those can become warm during use.
And should be cooled down before recharging.

-------------

I've never had ambient temp issues degrading my LiPo batteries.

but the colder temps could effect mechanical components...
As extreme cold can cause contraction to most metal components
and extreme heat can cause expansion.

This effect could increase or decrease rolling resistance
and create more drag or resistance for the components and battery.

example

extremely cold bearings and metal components can create more rolling resistance and cause things to run less efficiently,
possibly even reducing run time slightly.

But I'm not so sure a LiPo battery in of itself could be the fault.

Letting your pack rest before charging will increase the charge cycle lifespan of them.


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[Yeti guy]

Will 9°f affect my lipo battery's lifespan?

[mikebecher]

Originally Posted by Yeti guy

Will 9°f affect my lipo battery's lifespan?

Absolutely. I saw a very noticeable decrease in run time while I was in Colorado running at 15-20°F compared to the balmy 70-80° I usually run in at home. Same batteries, same rig, same type of driving, the only difference being temperature and elevation. I've run through a couple of the same packs since returning to Hawaii and there does not seem to be any permanent loss of capacity.

[Yeti guy]

Originally Posted by mikebecher

Absolutely. I saw a very noticeable decrease in run time while I was in Colorado running at 15-20°F compared to the balmy 70-80° I usually run in at home. Same batteries, same rig, same type of driving, the only difference being temperature and elevation. I've run through a couple of the same packs since returning to Hawaii and there does not seem to be any permanent loss of capacity.

Thank goodness because I had my yeti completely packed with snow inside! Had buggy wide open but the thtottle slowly phased slow and a bit faster. Thought my new battery was ruined.