Is it ok for a lipo to get hot?

[r/c basher]

Hey guys. When I fly my g2 the lipo gets hot because it sits right next to the motor, would this be a problem at all?

[akphill]

how hot is hot my lipos get to about 120 max temps i think there is a formula or spec chart on this forum someware that answers this question i think that they can get warmer but not real sure hope this helps a little

[akent]

I really am starting to think that it depends on the brand of lipo and how hard you push it as to how high a temperature it will be happy with.

Here in central Texas it has been over 100 for more than 55 days this summer! Record, needless to say.

I have puffed TWO batteries for my 450 and one for my HBFP (TODAY!!!!!!!). Today, I needed to fly and it was too hot for my bigger birds (afraid to puff the batteries).
So, I flew the HBFP, which has a 1200ma LiPo mounted forward.
That thing PUFFED, too!!!!!!!!!!!!!!!!!!!!!

I think these Lipos don't like anything even approaching 100 degrees!

Carp.
Kent

[r/c basher]

Opps my lipo battery in my g2 gets up to 150 F in Id say 90 degree weather. My brushed motor runs at an excess of 200F.

[19000rpm]

Phil's right there is a chart somewhere...

High ambient temps just add to the equation because the air, which we rely on to cool, isn't efficiently cooling anything.

Brushed motors run hot r/c. The extra amp draw of the realtively inefficient design adds more heat to the entire drive matrix including the ESC and battery. So, if it's really hot out don't push it. ;D

Happy landings

[BTCat]

Aug 15, 2009 17:13:56 GMT -6 r/c basher said:

Opps my lipo battery in my g2 gets up to 150 F in Id say 90 degree weather. My brushed motor runs at an excess of 200F.

What are using to measure your temps, RC? That is smoking hot. My motor seldom runs over 120.

[Solitaire]

150F is 10F higher than the max recommended, according to this chart.

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[r/c basher]

I wonder if it would get hot if it wasnt right next to the brushed motor? 19k when you ran your g2 when it was completely stock did your lipo get this hot? Bt remeber this is a brushed motor not a brushless motor. I use this: www3.towerhobbies.com/cgi-bin/wti0001p?&I=LXEMG5&P=7
Thanks guys for your input. I ran my lipo battery down below the recommended voltage by accident.

[BTCat]

Aug 15, 2009 20:10:40 GMT -6 r/c basher said:

I wonder if it would get hot if it wasnt right next to the brushed motor? 19k when you ran your g2 when it was completely stock did your lipo get this hot? Bt remeber this is a brushed motor not a brushless motor. I use this: www3.towerhobbies.com/cgi-bin/wti0001p?&I=LXEMG5&P=7
Thanks guys for your input. I ran my lipo battery down below the recommended voltage by accident.

My bad. I read right over the "brushed" part.

[19000rpm]

r/c I never actually measured the temp with the stock set up but the motor, ESC and battery got pretty hot.

The only thing I ever did that helped some was backing the motor pinion away from the main gear slightly and made sure the gears were centered which reduced the drag and helped the heating quite a bit.

After I did that the motor was still pretty hot but the ESC and battery were a lot cooler.

Running with too much pitch and/or draining the battery too far down (causes an increased amount of pitch to keep the heli up) also causes higher temps.

Happy landings

[r/c basher]

Ill try some of the things you said 19k to see if that helps.

[Raygun]

Even dropping one tooth on the pinon makes a big difference.. Ray

[r/c basher]

Aug 16, 2009 20:09:32 GMT -6 Raygun said:

Even dropping one tooth on the pinon makes a big difference.. Ray

To bad I dont have a pinion gear puller.

[19000rpm]

Just what you need r/c. www.toysonics.com/walkera-universal-pinion-gear-puller-g1001002.html

Happy landings

[akphill]

you could take your soldering gun the big one out and heat the pinion up and then pull it off the shaft one of BT's way of doing it just a suggestion