what kind of fire blanket for lipo batteries?

[dogman dan]

Obviously you wouldn't put a flimsy likely to fail can of gasoline on your back. It could rupture, spill on you, and if ignited, you would have a hard time putting yourself out.

But a flaming battery pack, once on fire, would be pretty easy to separate yourself from. It would be just as easy to get away from a gallon of gas, if it was not ruptured and spilling on you.

That's the question being asked here, how do you make the pack safe to carry.

Since physical damage has a reputation for causing hobby lico batteries to flame, step one is as obvious as it would be for carrying gas. Carry it in a good container that is not likely to allow spillage of gas, or denting and chafing holes in batteries. Of course, you wouldn't carry gas in a ziplock bag on your back. But you might carry it in a very sturdy aluminum fuel bottle. Not much different than the battery, don't carry them in just some plastic wrap either.

 

[doctorGONZO]

dog, I get it that you are a devil-may-care fellow who feels invincible and does not care if you crash and burn. Good for you.

You go ahead and burn all you want to. As for me, I will try to stay safe and and avoid taking serious risks that are unnecessary and produce no useful result.

Riding on two wheels with a can of GASOLINE or LIPO locked on your back may lead to circumstances that you have not yet explored. You might get blind sided by a vehicle out of nowhere which you never saw and dont remember whenever you ever come out of your coma in the hospital. But you could have so many vivid memories of months long burn treatment that it will not matter if you do not remember the car that T-Boned you.

Ypur choice. I dont care.

Have a nice day.

 

[brumbrum]

The back pack.....

in question arrived yesterday i can pack all seven 54v/3ah packs in the bag within their lipo fire bags with ease and compacted and with easy access to all the JST connectors from each pack. There is a zip within the pack against my back which fully opens where i can put several layers of differing flame retardant material which will also flap over the packs. All I need is some compacting material inside the top of the hard shell back pack to stop the packs from bouncing up and down. Side to side the lipos in their bags are very tight. The lipo bags will stop rubbing between individual packs. I cannot see how this would be more dangerous than having the lipos between my legs.

Dogman... It feels quite weighty as you described. I will probably use six of the packs for 18ah which equates to about 6.5 kg's or say around 13lbs.

Gonzo, the pack will only be used off road where their will be no traffic. I will compensate for a fall by using coiled sprung battery cable which I am currently sourcing.

 

[dogman dan]

FWIW, I don't have to imagine what the burn ward is like. Been there, done that, have the T shirt.

If you ( dr) actually read what I'm saying, you'd see I have spent pages trying to talk him out of it. But not because I'm afraid of a hazardous material.

After contact cement nearly killed me, I didn't get all phobic about flammable shit. But I did learn to take all the reasonable precautions. In a lifetime of construction work, you don't get it done by risk avoidance. You survive getting er done by risk management.

One of those risk managements for a trail bike, would be to put as much of the weight as possible in the correct places on the bike to reduce the crash frequency. Spread it out, some in the center, some in the bars, some in the back if you must. Only as a last resort would I go to a backpack, for water, batteries, or anything.

Only a damn fool would carry any chemistry of battery in a way that was vulnerable in a crash. What's the difference between having batteries taped to your frame, thrown unprotected into a bag, or similarly carried in a back pack?

When did I ever say you should do that? In this thread, in the very first post I made, I told him he needed to have a hard box inside the hard shell backpack. You sure don't have to crash to damage a pouch cell. It's a crucial thing to make your vehicle crashworthy, because as you point out, it happens. Backpack, or on the bike, it's gotta be able to go through hell with little or no damage. That goes for ALL chemistries of batteries.

Now talking to you Brumbrum, Make some little hard boxes for each set of packs!!! Unless they are already hardcase packs.

So if they do jostle around in there, like in a crash, they don't rub holes in the cells and catch fire. Only you can judge if the weight is enough to make you crash more. It matters little on easy to ride trails, matters a lot on the tough trails. You can ride the tough trails with the pack of course, it just won't be as easy to not crash is all.