Does anyone make an extra large LipoSack that I can stick my whole car into while charging? This would be much more convenient than removing the Lipo battery every time I want to charge it.

A reminder from the ROAR 2008 rulebook:
8.3.1.6.3 All Lithium Polymer packs used for motor power must be charged inside a “Lipo Sack” or similar fire mitigation device proven to withstand a minimum of an 8.4v 5000mah Lithium Polymer pack failing destructively without showing external flame

I think the idea of a failing lipo IN a car would be much more costly than removing it for charging. :thumbsup:

after using a lipo battery for a season and a half, I can't seem to get it to over 80 degrees when charging. How much of an idiot do you have to be to blow one of these things up?????????

This is the only Lipo sack being produced to my knowledge http://www3.towerhobbies.com/cgi-bin/WTI0095P?FVSEARCH=lipo+charging+sack&search=Go

I built a lipo tray for my slider car out of some old standoffs and battery retainers I had laying around two screws and the batterys out, my Hangman is a solid chassis but its just a matter of cutting two pieces of tape and removing two banana connectors.

its just a matter of cutting two pieces of tape and removing two banana connectors.

LOL, those of us still running nimh have no problem cutting battery tape, we do it all the time ......... so when the time come to switch to lipo it wont be a big deal ........ lol.

any pics of how you did your lipo tray ?


Rich

Tom....

C'mon, you know better than to put a statement like that out there. LOL

:dude:

I know these lipo guys just get lazier and lazier first no motor maintanance now no battery mantanance then they don't want to take there battery out of the car to charge it. whats next pay somone else to set your car up for you. Oh that been done too. What is this world comming to.

Why do you need a bag for charging lipos? I thought they didn't blow up or cause a fire.

They used that excuse just to sucker us in to switching to Lipos!!! If mistreated, they can do some damage too! Fire extinguisher doesn't work either! :rolleyes:

They used that excuse just to sucker us in to switching to Lipos!!! If mistreated, they can do some damage too! Fire extinguisher doesn't work either! :rolleyes:

I think the key statement in that post is "If mistreated."

This is another lipo charging sack. Not big enough for the whole car though. Not that it really should be IMO.

http://www.racers-edge.com/store/customer/product.php?productid=24882&cat=0&page=

Does anyone make an extra large LipoSack that I can stick my whole car into while charging? This would be much more convenient than removing the Lipo battery every time I want to charge it.

A reminder from the ROAR 2008 rulebook:


i think you should make your own lipo-tent, and please be sure to be inside of it when everything catches on fire.


thanks

i think you should make your own lipo-tent, and please be sure to be inside of it when everything catches on fire.


thanks

lol ! !

Where do you race that is sanctioned by ROAR?

we don't, but the club rules follow ROAR rules..... unless the senior members of the club don't like the rule.

we don't, but the club rules follow ROAR rules..... unless the senior members of the club don't like the rule.

tom - xl lipo sac aside, i think this should be in the dictionary under ambiguous

Or equivocal.

LOL I got a sack for you guys SRM

LOL... I'm sure you do

I've been talking with Mark Wood (CEO of WoodWorks, LLC - LipoSack manufacturer), and he has a new large LipoSack coming. The dimensions are 14"x18" which is large enough to fit the whole car into. He sending me some samples. Pictures, pricing and more info will be coming soon. He's not sure on the release date yet, but it will be in time for the upcoming racing season.

LOL I got a sack for you guys SRM

Butt is it Extra Large? LOL

NIp no extra charge , From the way i have seen lipos charge and why the need for the bag ,The charger turns off before any kind of issue can occur....I know SAFETY first ,Why dont they make a heating bag instead with lipos safe on it ..LOL ..

ROCKET

LOL I got a sack for you guys SRM

Steve,

He asked for extra large not micro.......lol Still doin your thing at school?

If the bag is a safety fire control device, wouldn't the larger bag allow a larger fire to occur? And in the confined space of the bag, wouldn't other materals in the bag (plastic, foam, rubber) feed the fire? It would seem that taking the battery out of the car for charging would be a lot safer and a lot less expensive than letting the whole car burn, wouldn't it?

Bingo!!! :thumbsup:

(fire needs air)

Either way, I'm not deathly afraid of my lipo anyway. I don't do anything stupid to it. Liposack is just an inconvenience to me, so if I'm forced to use one, I'd rather have it where I don't have to take the battery out of my car just to stick it in the bag.

i personally would rather have a fire over an explosion like we had with the nimh's last yr. i kinda like my fingers and other parts of my body where there at.

I already bought my fire supression system, and have it in my box at all times, even before Lipos...

All you need is a good ABC fire extinguisher. Even without Lipos you still have motors, batteries, and speed controllers that still go up in flames. not to mention a hot soldering iron that could cause problems.

At this point, I think Lipos are more stable than the rest of the items on that list

From the ROAR 2008 Rule Book;
"The use of a “dual layer” of fire protection from the ROAR Lipo testing procedures as well as mandating the use of a proven fire containment device while charging were developed for your safety, as well as the safety of those around you.....DISQUALIFICATION will be the result of....Charging a lipo pack outside of a “Lipo Sack”. The whole purpose of this rule is not to inconvenience anybody or impose unreasonable practices on the racer, it is to provide a margin of safety for the racer and those around him. I'm sure none of us will do anything overtly that would jeapordize the integrity of a LiPo pack (sic), however, mistakes are made and maybe the pack itself is faulty (remember the NiMH packs from last season). The fire protection devices as well as the monitoring of pack voltage before hitting the track are good procedures to enforce to insure everyone's safety. We should stop belly-aching about the obvious.

I don't think anyone is belly-aching here are they?

I do understand why the rules are in place, and yes I'll follow them. It does make sense. Kind of like driving in the snow. I trust myself in the snow, but the other people on the road...who knows? So I guess it's best if we all have our lipos in the silly sacks because you never know when somebody might make a mistake, act recklessly or just plain not know what they're doing. (I'm not saying this will never happen to me, just saying that most people probably think the same thing. So for the good of everyone's personal safety they have to make sure those around them have their stuff protected)

Still doesn't mean I have to like sacking it!!!

(fire needs air)

Either way, I'm not deathly afraid of my lipo anyway. I don't do anything stupid to it. Liposack is just an inconvenience to me, so if I'm forced to use one, I'd rather have it where I don't have to take the battery out of my car just to stick it in the bag.

Okay, now that your car is in the bag, when do you get to work on it??? I guess you'll have to wait til the battery is done! :rolleyes:

Well whatev. I don't care. I'll do whichever is more convenient. There's nothing to say that I can't put ONLY my lipo in the big sack if I need to work on my car. Obviously I wouldn't stick my whole car in the sack if I need to work on it.
:rolleyes: :rolleyes: :rolleyes: :p

If the bag is a safety fire control device, wouldn't the larger bag allow a larger fire to occur? And in the confined space of the bag, wouldn't other materals in the bag (plastic, foam, rubber) feed the fire?
Yes, but the other car materials (plastic, foam, rubber) are peanuts compared to the fuel released from the lipo batteries. The LipoSacks are designed to handle much more than our 2 cell lipo packs. I asked Mark Wood (CEO of WoodWorks, LLC - LipoSack manufacturer) about this issue. Here was his response that he emailed to me:


The LipoSack works in two ways:

1) The primary fire (ignition) is contained by the bag and allows the expanding smoke and gases to escape but contains the flying, burning debris that an igniting battery ejects.

2) Just as important as point #1, the bag also smothers the secondary fire that remains after the primary ignition has died down. Fire needs three components... heat, fuel and oxygen. By denying the fire oxygen in the confined space, the bag smothers any burning components that remain and all you have is a smoky mess. Granted, the car inside isn't going to fare very well in the aftermath but the options aren't too pretty either.

There is no magic here which is why it works so well. It's simple fire prevention techniques used in a different way specifically designed for preventing the flaming debris of a flash fire from spreading by appropriate containment. No technical engineering is needed with such a simple device.

Since I'm an airplane guy, my focus has been in that part of the RC hobbies. Aircraft usually START at three cells working up to 12 cells and beyond. (!) I personally have 6S 5000mah packs that I use regularly so I wanted to be able to manage at least that level of energy. That's been our goal all along. Notice in our Survivor's Gallery (http://www.liposack.com/Survivors/Dennis%20H..htm) a 4s 4500mah ignition not ten miles from where I live. The 9'x12' bag was never intended for managing that large of a pack but we were pleasantly surprised when it did. I wouldn't recommend making a habit of blowing up 4s packs in the small bag however. The 9x12 was actually designed for 3s 2100mah as evidenced in the testing video (http://www.liposack.com/video.htm) found on our website as well as all over YouTube but apparently outperforms that. We're confident in the capability of the large bag to manage a 6s 5000 pack. It should do just fine with the 2s 5000s the car gang are using.



It would seem that taking the battery out of the car for charging would be a lot safer and a lot less expensive than letting the whole car burn, wouldn't it?
It's definitely more risky and costly to have the entire car in the LipoSack if the lipo battery ever does catch fire. The convenience factor for me is why I was interested in the large LipoSack.

I noticed that it only takes 20 minutes to repeak the Lipo pack for the next race, so most racers will probably use 1 pack all night long. So, it really comes down to, do I want to remove the lipo pack from my car or not. It'll take me a couple of minutes to untape and retape the pack back into the car. Whereas it'll take only a few seconds to stuff the whole car into the LipoSack.

I'll race with NiMH or lipo batteries. But if I had to choose which one would explode, I'd much rather have a Lipo explode in front of me rather than a NiMH. Lipos release a firey thrust. They give us more time to react as well. But a NiMH instantly explodes with shrapnel! Could you imagine some NiMH shrapnel hitting a can of motor spray! That could be really bad for many people in that area.

Mark sent me a few samples of the large 9"x12" LipoSacks. Here are some pictures I took:
http://laddergames.com/images/forums/IMG_1148t.jpg

http://laddergames.com/images/forums/IMG_1150t.jpg

Nice product, I have one of the small ones and hope to never test it, watch the testing videos their pretty cool.
I got to thinking maybe I should get one of the larger ones because it would keep me from working on my car when its pretty good and making it REALLY BAD.......I know a couple other racers that might work out for...........not gonna mention your name :p

Are the large LiPo sacks ROAR approved?

Since it doesn't seem that ROAD specifies the demensions of the sack, I see no reason why it isn't.