R/C Tech Forums

Go Back   R/C Tech Forums > General Forums > Electric Off-Road

Reply
 
Thread Tools Search this Thread
Old 10-28-2007, 11:38 AM   #1
Tech Elite
 
streetracer745's Avatar
 
Join Date: Oct 2006
Posts: 2,291
Send a message via AIM to streetracer745
Default Lipo

I'm assuming this is safe but I want to be sure. Is it safe for a lipo battery to get hot while running it? It doesn't get even warm when its charging so I wanted to be sure it was ok for it to when I run it. Thanks
streetracer745 is offline   Reply With Quote
Old 10-28-2007, 11:43 AM   #2
Tech Elite
 
joe of loath's Avatar
 
Join Date: Mar 2007
Location: Bristol, England, United Kingdom
Posts: 4,857
Trader Rating: 1 (100%+)
Default

where did you get the battery? they shouldn't get hot, unless they are cheapo cells that have a really low continuos C rating.
__________________
HPI E-Firestorm - Tamiya TA05 racer (carbon chassis, 10.5 brushless etc) - LRP Blast S10 BX - Revo 2.5r truggy conversion (in progress)
joe of loath is offline   Reply With Quote
Old 10-28-2007, 02:37 PM   #3
Tech Elite
 
glassdoctor's Avatar
 
Join Date: Aug 2006
Posts: 2,250
Trader Rating: 4 (100%+)
Default

Lipos don't get warm while charging like a nimh. But they can heat up when discharged... how hot depends on how "hard" it's run. They won't get hot unless they are pushed to the limit. A cheap pack is much easier to do that.

The latest high end lipos are good enough that it's not easy to push them hard enough to get them hot. (in normal car use)

If you have packs that are getting hot, I would recommend not letting it hotter than like 130 F just to be safe.
glassdoctor is offline   Reply With Quote
Old 10-28-2007, 04:18 PM   #4
Tech Elite
 
streetracer745's Avatar
 
Join Date: Oct 2006
Posts: 2,291
Send a message via AIM to streetracer745
Default

they are maxamps 5000 3s packs. im running it in a rustler with a vxl system. and if thats the case the nim completely safe because they arent getting "hot" so to say. they arent hot to the touch but are deffinetly warm. it also all but touches the esc which i didnt think about and that gets up fairly hot to that could be why. will that hurt it? sitting next to the hot esc?
streetracer745 is offline   Reply With Quote
Old 10-28-2007, 04:41 PM   #5
Tech Elite
 
glassdoctor's Avatar
 
Join Date: Aug 2006
Posts: 2,250
Trader Rating: 4 (100%+)
Default

Lipos perform the best when they are warm. I actually pre-warm my packs to @90-100 if racing in cool conditions. From that point they normally only heat up maybe 10-15*

I have a Maxamps 4s 5000mah pack that I run in my 1/8 buggy.... it does a good job, never got too hot on me.

They will feel warm to the touch even at 90*

If they ever feel "hot" then I would definitely temp them so you know if it's ok or not.
glassdoctor is offline   Reply With Quote
Old 10-28-2007, 04:43 PM   #6
Tech Elite
 
joe of loath's Avatar
 
Join Date: Mar 2007
Location: Bristol, England, United Kingdom
Posts: 4,857
Trader Rating: 1 (100%+)
Default

50 degrees C is optimum temperature for Lipos. any cooler or hotter they don't perform as well.
__________________
HPI E-Firestorm - Tamiya TA05 racer (carbon chassis, 10.5 brushless etc) - LRP Blast S10 BX - Revo 2.5r truggy conversion (in progress)
joe of loath is offline   Reply With Quote
Old 10-28-2007, 04:47 PM   #7
Tech Elite
 
streetracer745's Avatar
 
Join Date: Oct 2006
Posts: 2,291
Send a message via AIM to streetracer745
Default

they never feel hot at all. warm yes but never hot. i wouldnt think the yare over 110-120. thanks. sorry it was a stupid ? but im a newb with lipo so i wanted to be safe. thanks
streetracer745 is offline   Reply With Quote
Old 10-28-2007, 04:49 PM   #8
Tech Elite
 
joe of loath's Avatar
 
Join Date: Mar 2007
Location: Bristol, England, United Kingdom
Posts: 4,857
Trader Rating: 1 (100%+)
Default

not a stupid question, better to be on the safe side.
__________________
HPI E-Firestorm - Tamiya TA05 racer (carbon chassis, 10.5 brushless etc) - LRP Blast S10 BX - Revo 2.5r truggy conversion (in progress)
joe of loath is offline   Reply With Quote
Old 10-29-2007, 02:56 AM   #9
Tech Master
 
d4_racer's Avatar
 
Join Date: Sep 2006
Location: in the emergency room :-(
Posts: 1,479
Trader Rating: 6 (100%+)
Send a message via MSN to d4_racer
Default

depends what you mean by 'hot'.

if you touch the pack and it starts to burn you, then its TOO HOT!!!! lol

if you touch the pack and its warm to fairly warm, so that it doesnt burn you and that you can touch it forever, then its FINE.

i found that interesting at first too, how lipos dont get warm at all when charging but after a hard bashing they get nice n warm.

hope that you feel safe now knowing ur pack isnt about to blow up on ya just cause its getting warm
__________________
\____
==\_\___===___ | *HPI Baja SS kit;*
==(@)\_______\(o) +UNDER CONSTRUCTION+
^^^^^^^^^^^^

out of racing, but a proud marshall, lol
d4_racer is offline   Reply With Quote
Old 10-29-2007, 04:29 AM   #10
ROV
Tech Fanatic
 
ROV's Avatar
 
Join Date: Apr 2007
Location: Australia
Posts: 823
Trader Rating: 4 (100%+)
Default

This is all great advice,,there is not point guessing what is safe on not when it comes to yourself and your very expensive gear.

have a look at a WATTS UP meter, when using lipo and brushless gear i have found it be priceless is saving gear,,,,it will tell you max draw in amp+volts+watts...
when matching a motor to load and esc load,,,,match the output to your esc max amps, your motor max amps and battery max output....
a lipo can overeload your gear pretty easy...check all your max amp working limits...
WATTS UP works a little like a dyno for your car,,find out how many watts of power you produce.....
__________________
TELL THEM ROV'S HERE AND HE'S RUNNIN WHEELS THAT ARE READY TO RACE !!!
CEO TRASH TALK TOURING HOME OF WA'S CHEAP TRASH PISSTAKES
AM PSYCLONE,HOTBODIES D4,NOVAK,LRP,HACKER,MEGA,EFLIGHT.JR,KOPRO,HITECH, SPEKTRUM,TRAKPOWER,OS,CDC,SWASHDRIVE JET,ZENOHA,WEMOTECH DUCTED,LIPO4GO,LOSI,KOKOM,CDC,5IVE,8IGHT,XXCR,LST,CASTLE
ROV is offline   Reply With Quote
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
NIP Novak 5amp lipo regulator with volt monitor, NIP venom 1600mah lipo rx pack sharkman R/C Items: For Sale/Trade 1 06-10-2008 02:36 PM
LIPO CHARGER LIKE HYPERION AND LIPO BATTS AND MAYBE CHEAP 12TH SCALE jslider R/C Items: Wanted to Buy 1 02-16-2008 07:55 AM
FS TrakPower 7.4V 4900MAH Hardshell Lipo,TrakPowerBalancer,TrinityReference 4500 Lipo ffpm46 R/C Items: For Sale/Trade 11 01-29-2008 06:11 PM
Pg 2 on Complete Sellout Motor rebuild Orion Lipo, peak Lipo 4800 and more gunlocators R/C Items: For Sale/Trade 18 10-08-2007 02:11 PM
Lipo charger with power supply and 2 cell lipo pack fweemindan R/C Items: For Sale/Trade 3 01-03-2007 11:51 PM



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are Off



All times are GMT -7. It is currently 05:04 AM.


Powered By: vBulletin v3.9.2.1
Privacy Policy | Terms of Use | Advertise Content © 2001-2011 RCTech.net