RCCrawler Forums

dieselfuel · 07-03-2009, 11:29 PM

first off, yes, i searched...

i just got done doing some test running on my new rock racer tuber. its running a Sidewinder ESC and a 27t Epic motor. after about 15min of running the ESC is sitting at 110* the motor is 120*, both of those i know are fine. but the 3s lipo is sitting at 115* and not puffed but a little softer than it is at room temperature. it runs hotter in my racer than it does in my berg. whats a safe maximum temp for lipo batteries?

ROCKETRON1969 · 07-04-2009, 12:29 AM

yes the temps are fine you want the motor no hotter than 135 and make sure your speedo is not up side down either run it on its side or where the heat sink is up. if its upside down move it.and if you want to cool the motor down gear it down a tooth on the pinion.hope this helps

Rick Findley · 07-04-2009, 12:49 AM

Its been my experinece to read the instructions that come with the product. Staying within the manufacturers recommendations ensures longevity and safe operation. Keeping you a happy camper.

Now if your are in a competition, you do what you have to do to win.

dieselfuel · 07-04-2009, 01:50 AM

Quote:

Originally Posted by ROCKETRON1969

yes the temps are fine you want the motor no hotter than 135 and make sure your speedo is not up side down either run it on its side or where the heat sink is up. if its upside down move it.and if you want to cool the motor down gear it down a tooth on the pinion.hope this helps

hmmm, the ESC is upside down but ive done that before and never had a problem.. the ESC is not what im worried about, i can throw a little fan on it if needed, but the lipos are my concern.

Rockcrawler · 07-04-2009, 03:36 AM

Quote:

Originally Posted by dieselfuel

hmmm, the ESC is upside down but ive done that before and never had a problem.. the ESC is not what im worried about, i can throw a little fan on it if needed, but the lipos are my concern.

What brand battery?

TP's instructions......

Operating Temperature
Charge: 32 to 113 degrees F
Discharge: 32 to 140 degrees F
1) Always allow a battery to cool down to ambient temperature before re-charging.
2) During discharge and handling of batteries, do not exceed 160 degrees F.

MadForce · 07-04-2009, 03:46 AM

115F is close to 46C which in my book is cool for a lipo draining at 20c or 30c. I use 2200 3s on a 3D 450heli, in winter they go 40-46C (104-115F), while in summer they go 55 to 70C (131-158F) and they still hold great. My first heli lipo which is one year old, still works flawlessly no bloating or drop in power. I think, not sure though, that 75-80C is the safe limit for lipo and I read in my high school chemistry book (don't laugh) that lithium self combusts at temps over 100C. I won't put my lilly on an anvil on that one though.

***EDIT*** Ambient temps during summer range in the 37-45C here in Greece.

Rockcrawler · 07-04-2009, 03:49 AM

Quote:

Originally Posted by MadForce

I read in my high school chemistry book (don't laugh) that lithium self combusts at temps over 100C. I won't put my lilly on an anvil on that one though.

I have heard that if they get hot enough they will catch fire so that would not surprise me.

binaryterror · 07-04-2009, 09:28 AM

I race 1/10th electric and routinely they come off at 100-120 and thats considered fine.

My Berg pack on 3S gets to about 130, still runs great. I do let it cool after getting to that temp to recharge.

dieselfuel · 07-04-2009, 10:14 AM

ok cool, thanks a lot guys. they're all MysteryRC lipos (see: Ebay lipos) never had any problems out of them. ive had them get much hotter in my berg when my front motor was going bad and if we're out in the summer sun running our bergs then they get pretty hot too. ive always heard all the typical safety precautions about lipos but never gotten ahold of any actual safe temperature ranges.

ROCKETRON1969 · 07-04-2009, 12:49 PM

also if you see the lipo pack start to swell dont use it means the pack is going bad.also on spedo even if you put a fan on it the heat is going right back into the spedo reguardless of fan or not cause its still upside down.hope this helps you a little more

Kamikaze · 07-04-2009, 12:54 PM

My experience tells me that they will let you know when they are to hot. They have a built in smoke system that will signal you if there is a problem.

Harvo · 07-04-2009, 01:06 PM

Good gosh. How do you get lios that hot? Mine never ssem to get much above ambient.

MadForce · 07-04-2009, 05:29 PM

Imagine the ambient is 38C under shade, then in the sun it is close to 55C. Now if a battery discharges at 1C ( no heat generated) then the least temp is the ambient ~55C

dieselfuel · 07-04-2009, 05:33 PM

Quote:

Originally Posted by ROCKETRON1969

also if you see the lipo pack start to swell dont use it means the pack is going bad.also on spedo even if you put a fan on it the heat is going right back into the spedo reguardless of fan or not cause its still upside down.hope this helps you a little more

im well aware that lipos swell up and reversing the wires on the fan will fix that...

Quote:

Originally Posted by Kamikaze

My experience tells me that they will let you know when they are to hot. They have a built in smoke system that will signal you if there is a problem.

you're a jackass!

MadForce · 07-05-2009, 11:10 AM

Today noon I went for a couple of batts (actually six) with trusty axial under the sun. Ambient temp was 38C in shade, 54C in the sun and the asphalt was 61C. I temped the fourth battery and it showed 154F a bit before she died. The last two I went easy on, cause the motor was starting to dislike the temps.

Quote:

Originally Posted by Kamikaze

My experience tells me that they will let you know when they are to hot. They have a built in smoke system that will signal you if there is a problem.

Darn didn't know that I'll take one apart to see for my self

, wait... I think I'll better put one in the back of my drifter

for real kick a$$ smoke effect. Now for a way to heat it up..............

Duuuuuuuude · 07-05-2009, 04:20 PM

Quote:

Originally Posted by dieselfuel

im well aware that lipos swell up and reversing the wires on the fan will fix that...

I fail to see how rewiring the fan will keep lipo's from swelling or shrink them back to normal size...:-P

dieselfuel · 07-06-2009, 03:22 PM

Quote:

Originally Posted by Duuuuuuuude

I fail to see how rewiring the fan will keep lipo's from swelling or shrink them back to normal size...:-P

i was replying to the two points that rocketron1969 posted.

EeePee · 07-06-2009, 03:24 PM

Quote:

Originally Posted by dieselfuel

i was replying to the two points that rocketron1969 posted.

No shit?

MadForce · 07-06-2009, 04:26 PM

Diesel before you rewire the fan, check its' contruction. If the blades are symmetrical then go for it, if they are assymetrical (like curved) then don't bother at all. In the later case the airflow created by an assymetrical reversed fan is less than a soda fart.

dieselfuel · 07-06-2009, 04:34 PM

well it doesnt much matter now, the ESC took a shit on me after 3 packs... piece of castle shit. ill probably just replace it with an FXR.

07-03-2009, 11:29 PM	#1
dieselfuel I wanna be Dave Join Date: Jan 2006 Location: Henderson/Las Vegas, NV Posts: 5,032	safe lipo temperatures??? first off, yes, i searched... i just got done doing some test running on my new rock racer tuber. its running a Sidewinder ESC and a 27t Epic motor. after about 15min of running the ESC is sitting at 110* the motor is 120, both of those i know are fine. but the 3s lipo is sitting at 115 and not puffed but a little softer than it is at room temperature. it runs hotter in my racer than it does in my berg. whats a safe maximum temp for lipo batteries?

07-04-2009, 12:29 AM	#2
ROCKETRON1969 Newbie Join Date: Jun 2009 Location: Mcgregor Posts: 18	operating temps yes the temps are fine you want the motor no hotter than 135 and make sure your speedo is not up side down either run it on its side or where the heat sink is up. if its upside down move it.and if you want to cool the motor down gear it down a tooth on the pinion.hope this helps

07-04-2009, 12:49 AM	#3
Rick Findley Newbie Join Date: Dec 2008 Location: Payson Posts: 33	Its been my experinece to read the instructions that come with the product. Staying within the manufacturers recommendations ensures longevity and safe operation. Keeping you a happy camper. Now if your are in a competition, you do what you have to do to win.

07-04-2009, 03:46 AM	#6
MadForce RCC Addict Join Date: Nov 2008 Location: Greece, sun, sea and rocks Posts: 1,242	115F is close to 46C which in my book is cool for a lipo draining at 20c or 30c. I use 2200 3s on a 3D 450heli, in winter they go 40-46C (104-115F), while in summer they go 55 to 70C (131-158F) and they still hold great. My first heli lipo which is one year old, still works flawlessly no bloating or drop in power. I think, not sure though, that 75-80C is the safe limit for lipo and I read in my high school chemistry book (don't laugh) that lithium self combusts at temps over 100C. I won't put my lilly on an anvil on that one though. *EDIT* Ambient temps during summer range in the 37-45C here in Greece.

07-04-2009, 09:28 AM	#8
binaryterror I wanna be Dave Join Date: Jan 2004 Location: Detroit Posts: 3,583	I race 1/10th electric and routinely they come off at 100-120 and thats considered fine. My Berg pack on 3S gets to about 130, still runs great. I do let it cool after getting to that temp to recharge.

07-04-2009, 10:14 AM	#9
dieselfuel I wanna be Dave Join Date: Jan 2006 Location: Henderson/Las Vegas, NV Posts: 5,032	ok cool, thanks a lot guys. they're all MysteryRC lipos (see: Ebay lipos) never had any problems out of them. ive had them get much hotter in my berg when my front motor was going bad and if we're out in the summer sun running our bergs then they get pretty hot too. ive always heard all the typical safety precautions about lipos but never gotten ahold of any actual safe temperature ranges.

07-04-2009, 12:49 PM	#10
ROCKETRON1969 Newbie Join Date: Jun 2009 Location: Mcgregor Posts: 18	also if you see the lipo pack start to swell dont use it means the pack is going bad.also on spedo even if you put a fan on it the heat is going right back into the spedo reguardless of fan or not cause its still upside down.hope this helps you a little more

07-04-2009, 12:54 PM	#11
Kamikaze I wanna be Dave Join Date: Oct 2005 Location: Columbia TN Posts: 6,154	My experience tells me that they will let you know when they are to hot. They have a built in smoke system that will signal you if there is a problem.

07-04-2009, 01:06 PM	#12
Harvo I wanna be Dave Join Date: Mar 2008 Location: In the Dark Edges of your Mind Posts: 6,386	Good gosh. How do you get lios that hot? Mine never ssem to get much above ambient.

07-04-2009, 05:29 PM	#13
MadForce RCC Addict Join Date: Nov 2008 Location: Greece, sun, sea and rocks Posts: 1,242	Imagine the ambient is 38C under shade, then in the sun it is close to 55C. Now if a battery discharges at 1C ( no heat generated) then the least temp is the ambient ~55C

07-06-2009, 04:26 PM	#19
MadForce RCC Addict Join Date: Nov 2008 Location: Greece, sun, sea and rocks Posts: 1,242	Diesel before you rewire the fan, check its' contruction. If the blades are symmetrical then go for it, if they are assymetrical (like curved) then don't bother at all. In the later case the airflow created by an assymetrical reversed fan is less than a soda fart.

07-06-2009, 04:34 PM	#20
dieselfuel I wanna be Dave Join Date: Jan 2006 Location: Henderson/Las Vegas, NV Posts: 5,032	well it doesnt much matter now, the ESC took a shit on me after 3 packs... piece of castle shit. ill probably just replace it with an FXR.

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