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T-REX 450 › battery puffing question
08-12-2007 07:39 PM  10 years agoPost 1
Tonic

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Des Moines

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I bought a couple of 2000 20C batteries from United Hobby out of China. They were $30 each, have performed good and I have mybe a 100 flights on each. They have a condion that feals like and air pocket under the plastic battery wrapping. Is this a puffing sympton our just air under the plastic?

Thanks,

Tonic

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08-12-2007 08:07 PM  10 years agoPost 2
Gyronut

rrProfessor

Martinsville In.

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Well if you can feel some give to it then they're puffed but not necessarily bad though.

Keep a sharp eye on them esp when chargeing.

If anything eles happens tp them then get rid of it. Its not worth keeping around and risking a fire.

Rick

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08-12-2007 08:15 PM  10 years agoPost 3
Tonic

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Des Moines

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I really think it's just air trapped under the plastic wrap.

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08-12-2007 09:16 PM  10 years agoPost 4
dct

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San Angelo TX.

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If you got 100 flights on those cheap batteries I would call you very lucky...
I would buy some more if there working that good for you.
I will never buy anything from ((United Hobby )) again..
Oh, 100 flights ?
I have read about some people getting 300 flights out of TP batteries!
Just remember , I didn't say I have.
But I have gotten about 150 flights out of some TP 2100 pro-lite with easy flying.
I now use TP 2200 extreme batteries for a little more power.

**Now doing Forward Flight And EASY 3d! And having a Ball !!**

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08-13-2007 06:50 AM  10 years agoPost 5
hotgluedheli

rrApprentice

USA

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dct.. why won't you buy from them again?I bought some stuff from them a few times and they have been very good so far. Can't beat their prices.

I crash therefore I am

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08-13-2007 06:53 AM  10 years agoPost 6
lowflyer101

rrKey Veteran

garden grove, CA

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100 flights for $30 lipo, you are lucky man

my fav. brand are thunder power and hyperion .. i am trying the flight power EVO this week

<-freedoom flyer->

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08-13-2007 06:54 AM  10 years agoPost 7
hotgluedheli

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USA

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tonic.. the batteries have a 1 year warranty and you can get warranty service in the U.S. according to the website.

I crash therefore I am

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08-13-2007 11:57 AM  10 years agoPost 8
Tonic

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Des Moines

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hotglueheli,
I'll check that out. I've only been flying a year and also have 2 TP2100 that I got at least 250 flights on each. I fly like 5 to 10 time a day ...like taking a cigarette brake. I'd still like to know for sure if I even got a puffing situation. Like I said it just feels like air under the plastic wrap.

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08-13-2007 12:09 PM  10 years agoPost 9
TrexRookie

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San Francisco, CA

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how aggressively do you fly?

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08-13-2007 12:31 PM  10 years agoPost 10
bilbo

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Boston, MA - USA

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Like I said it just feels like air under the plastic wrap.
Air doesn't just somehow get inside the battery cells. Lipos puff because gas gets released from the battery material, but is trapped inside the cell covering. So if it feels like there's air trapped in your battery cells, that means they're puffed.

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08-13-2007 04:45 PM  10 years agoPost 11
dct

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San Angelo TX.

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I don't think anyone will give you warranty on one year old cheap batteries. And no way from ((United Hobby)).
Some one asked why I won't buy from them again.
First, have you ever read all the post about how bad they are?
Must be hundreds of them ? They have changed there name more then once IMO to try and hide. Next, I myself had bad experance with them.
Also, another flyer here also the same bull $hit from them.
One of my orders I placed with over 100 in stock of the thing I needed was put on back order after showing good for 3 weeks! It took 3 months to get it! Next they are cheap and the old saying ( buy cheap buy twice ) is true. I got one of there motors and this one is a hacker clone. And after testing it against the real one, it's 700 rpm's slower with same props tried many times. Also it gets hot very fast! In about 15 seconds at wide open throttle you couldn't touch it! Yes it cost $20.00 compared to $60.00 or so for the real one!If you can fly your planes or helicopters with a lot less power and fly at half throttle most of the time these cheap motors might work for a little while. If you don't have a lot of money in a real cheap foamy or time and you don't really car if it goes in go for it.
The other flyer I was telling you about same thing as me. He order some things, one was a motor for a plane he was thinking about building, and after many weeks of waiting for his parts to come in THEY SENT THE WRONG MOTOR and some of the order was still on back order even when showing in stock! Now you should just try and send back a order to exchange !!!! I think he is still wating, Oh,,, the motor they sent to him,,, he can't even find it on there web site no one seems to know what the hel? it is!!!Now how about shipping and handling cost? Add anything with a little weight to your order and all bets are off. The shipping is very high!!! Most of the time you can buy it here (USA) for less if you add shipping to it.And you can deal with a good company with good service here in the states. I don't want to get into keeping are money here in are country !
If you have weeks that you can spare and don't need these things maybe it will work for you.

**Now doing Forward Flight And EASY 3d! And having a Ball !!**

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08-13-2007 05:17 PM  10 years agoPost 12
dezflyer

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Apple Valley, CA

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i bought two of them to learn on my SE, they lasted about 30 - 40 flights. both puffed when i started doing mild, and i mean very mild, 3d. you know something aint right when the cells say 20-30c on them. what the heck does that mean? lol. in retrospect, i wish i had bought ONE Flight Power 25c 2170 instead. ill never buy cheap batteries again after flying FP's.

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08-13-2007 05:51 PM  10 years agoPost 13
hotgluedheli

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USA

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dct.. thanks for your post. Yah I can see your point now. I guess the saying holds true here.. you get what you pay for . Actually I also made the mistake of buying two motors because they were very cheap and looked good. They do get super hot super fast and start to lose power but I figured they werent' meant for helicopters but for planes. I don't know about that actually. One thing I did notice when I first got them was that when you turn the motor there is hardly any resistance from the magnets. I found that peculiar for a motor. I also bought 2 of their D9 batteries and one had a bad cell. It was puffed. I removed it and made it a 3s battery. I just started testing and using them so I don't know how long they will hold up. I am using their speed controller that has built in cell protection. It seems to work well so far. That brings me to another question.. is it more important to draw 80% capacity from a lipo or just to keep the volage from falling below 3v?. Thanks again for your informative posts.

I crash therefore I am

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08-13-2007 06:42 PM  10 years agoPost 14
Seablade

rrKey Veteran

earth

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battery safety

just a quickie.
please do a search for an RC club in Utah, they do an ongoing testing on lipos catching on fire...nice videos - these things go up like bbq grills on the 4th of July. Serious flame output.
rather be safe then sorry.

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08-13-2007 09:36 PM  10 years agoPost 15
dct

rrVeteran

San Angelo TX.

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question.. is it more important to draw 80% capacity from a lipo or just to keep the volage from falling below 3v?. Thanks again for your informative posts.
IMO I wouldn't run a battery below 10.5 volts total taken as soon as you can after landing! One minute later and volts will be over 11 volts. Any battery will be lower in flight! I worry about volts when flying. Most of my batteries checking as soon as I can are about 11 volts.
I also try and never use more then 75 to 80% of battery.
Most of the time, it takes me less then 30 seconds from the time my timer goes off too the time I'm on the ground. Unless it very windy.

**Now doing Forward Flight And EASY 3d! And having a Ball !!**

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08-13-2007 10:18 PM  10 years agoPost 16
Wingman77

rrProfessor

Pulaski Tennessee

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Most of the time, it takes me less then 30 seconds from the time my timer goes off too the time I'm on the ground.
that is a really long time

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08-13-2007 10:34 PM  10 years agoPost 17
bilbo

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Boston, MA - USA

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Most of the time, it takes me less then 30 seconds from the time my timer goes off too the time I'm on the ground.
that is a really long time
How can you say "less than 30 seconds" is a long time? 1 microsecond is less than 30 seconds!

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08-14-2007 12:32 AM  10 years agoPost 18
dct

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San Angelo TX.

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Quote
--------------------------------------------------------------------------------

Most of the time, it takes me less then 30 seconds from the time my timer goes off too the time I'm on the ground.
--------------------------------------------------------------------------------

that is a really long time
Not really, my timer goes off 30 seconds before the time it's set for and most of the time I'm half a football field away.
I also, try and land in a space about 3'x 3' the wind here is not blowing any at 10 to 15 mph here!

**Now doing Forward Flight And EASY 3d! And having a Ball !!**

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