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04-24-2009 02:58 AM  10 years ago
Topic Vote0Post 1
Robco

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Cumberland Gap Virginia

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Lipos getting Hot
I have a trex 450S with Align 3500 motor and Align 35X ESC, My question is my Lipos is getting Hot 130 degrees.I have 2 FP 2170 and 1 Common sense 2100, I never put over 5 to 6 min on them always balanced them. They never done this last year when they where bought, I run them down to 11.45 max. ESC and Motor is warm but my battery's is around 128-130 degrees, I am still new to electrics can some tell me what is going on? I did have a Hitec 65 just go dead but, replaced it sorry for a long question. Thanks Robco
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04-24-2009 03:34 AM  10 years ago
Raydee

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Western New York

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Actually that is a good temp for optimum performance and lower resistance for Lipo's. I know guys that will preheat their Lipo's to 120 before they even use them and they stay cooler and run better than whrn they are run at room temps.

If you are really worried check your setup for binding, tight belt or a bad gear mesh. You can always drop a tooth on your pinion too and see if that helps.
The Future of Nitro is ELECTRIC
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04-24-2009 03:51 AM  10 years ago
fenderstrat

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Aston,Pa

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check all electrical connections,a bad connection will add resistance

as mentioned,check your gear mesh and belt tension

also your pitch,too much pitch with not enough headspeed makes the power train work harder than necessary

also you have said "they didn't do this last year"how many cycles are on them?Lipos do wear out,even if you take good care of them,if they have a few hundred cycles,they might just be getting tired
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04-24-2009 04:55 AM  10 years ago
Rob_T

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they might just be getting tired
That's my guess too.
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04-24-2009 11:00 AM  10 years ago
Robco

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Cumberland Gap Virginia

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I probably have about 40-50 cycles on them, I usally fly my nitro, I will go back over everything, my main gear is new but the tension is ok,next nice day I have I'll check it out and let you all know. Thanks alot .....Robco
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04-24-2009 03:24 PM  10 years ago
kcordell

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O Fallon, MO

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That's about right for battery temps after flight. Plus, they make great handwarmers after a winter flight.
Also, lipo's (I see the arguements coming) should be around 100F for best charging. Kinda the opposite of the old nicad days when we put them in the freezer before charging.
Team Synergy/Rail, Team Scorpion, YS Engines, VelTye
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04-24-2009 10:39 PM  10 years ago
Raydee

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Western New York

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No arguements here, sounds pretty spot on to me.The Future of Nitro is ELECTRIC
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04-25-2009 02:11 AM  10 years ago
Robco

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Cumberland Gap Virginia

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I did manage to get 1 flight in this afternoon,Battery tempature was 129 dregee's so, your right I just hope they don't puff.lol I thank you all for your answers Robco
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04-25-2009 03:50 AM  10 years ago
TJinGuy

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Socorro, NM - USA

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What was the ambient temp at the time of the flight? Was the pack at room temp when you started?- Chris

Team New Mexico
TJinTech
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04-25-2009 04:15 AM  10 years ago
Robco

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Cumberland Gap Virginia

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Yes ,it was at room temp TJinGuy. ...Robco
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04-25-2009 04:46 AM  10 years ago
jag8864

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calif

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Lipo HEAT
WHat is the right temp battery for a battery before a flight should it be warmer than room temp I always thought that heat was bad for lipos and on a 3 cell batteyr what should a good flight time be on 910Mhn Thank you
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04-25-2009 05:03 AM  10 years ago
Raydee

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Western New York

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Nope, preheating lipo's is a good thing. The resistance on a Lipo decreases as the temp goes up. As long as you keep them under 140* you are in good shape. The WORST thing you can do is run them cold, that seems to make them puff faster than anything.The Future of Nitro is ELECTRIC
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04-25-2009 08:15 AM  10 years ago
jag8864

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calif

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battery heat
what about charging should they be warm or at room temp thank you
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04-25-2009 01:27 PM  10 years ago
kcordell

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O Fallon, MO

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Charging lipos should be at around 100F. If you go to some early season fun flys where the weather is cool, you will see guys with the lipos on the dashboard of their cars warming up.Team Synergy/Rail, Team Scorpion, YS Engines, VelTye
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04-25-2009 01:57 PM  10 years ago
Raydee

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Western New York

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Yep I bought a cheapy 12 volt cooler/Heater and on the way to the pond(boats) or field I will preheat my lipo's for about 45 min. Most companies will tell you to let the cells cool to room temp before charging but I usually just wait till they are under 100* and recharge mine with no ill effects so far.The Future of Nitro is ELECTRIC
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04-25-2009 03:13 PM  10 years ago
T-Rex-Flyer

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Panama City, Fl

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I know guys that will preheat their Lipo's to 120 before they even use them
Really? Name a couple.
If the wings are traveling faster than the fuselage, it's probably a helicopter.
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04-25-2009 03:30 PM  10 years ago
Raydee

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Western New York

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First let me start by saying that I am no Lipo battery expert. I will say that before I bought my first pack I did a lot of reading and wanted to make sure I knew how to care for these cells before I even tried one. The last thing I wanted to do was waste my money or even worse, burn my house down.

I mainly run Fast electric boats (Look on Youtube under Raydee to see my vids), there is a guy from Germany that holds the record for fastest electric boat (140 plus mph) he did extensive testing of lipo cells including preheating and confirmed that preheating cells before use makes a huge difference in performance and longevity. The internal resistance of Lipo cells decreases as the temp increases...to a point of course. He did voltage, temp recordings as well as IR and in every case the cells performed better, stayed cooler and held better voltage when the cells were preheated.

I am sure there are skeptics but you can search many other forums and articles on the subject. I know I said I would never easte my time preheating lipo's but after I tried it I will always preheat. I am sure if you live in a warmer climate than I do that it won't be such a concern but for me most of the season is on the cool side and I need my Lipo's to last.
The Future of Nitro is ELECTRIC
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04-25-2009 06:40 PM  10 years ago
TJinGuy

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Socorro, NM - USA

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I can confirm that the internal resistance readings are lower on warmer packs. I noticed it from charging with my Cellpro 10S. For example if a pack was at 70F and I charged it, it would read about 9mohms per cell on average. At 100F it would read more like 6mohms.- Chris

Team New Mexico
TJinTech
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04-25-2009 09:42 PM  10 years ago
Robco

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Cumberland Gap Virginia

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130 degrees is Hot to me but,I only got this Heli to try EP and I like it a lot (cleaner than nitro), just testing the waters.I am going to a bigger EP Heli, if these lipos don't scare me away . I have mine in a fire proof safe and Lipo sacks ,maybe another metal box lol, thats the reason I ask about the degree's. so I am going to try some of your suggestions. Thank you all Robco
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04-26-2009 12:05 AM  10 years ago
TJinGuy

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Socorro, NM - USA

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Man LiPos just don't explode for no reason! Actually they don't explode at all, they simply vent out smoke and sometimes fire. They do create a lot of heat but it doesn't last for long and it is decently concentrated.

But none of that matters because if you take care of your LiPos, they will serve you well and for a long time.
- Chris

Team New Mexico
TJinTech
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