There’s more pics here:
Little bit more detail here. Did two builds like this
I love those PCB’s, the guides for the balance leads are slick too. How does the sense wire know which one it is in the pack?
Can’t you sell us some of those PCB’s? I know others have asked so here goes again 
EDIT: I mean I guess one could send the image of the PCB to http://www.pcbway.com and have them make it. But if you are selling them, I sir would be most interested in a few for a pack I am doing right now.
I also remember this, at the time I though damn these things are dangerous, I’m going to open up my enclosure and see if everything is perfect, so I did it, it was months ago, however it did happen to me later on.
I’m going to fix the batteries on my new build pretty tight
Well it seems the right way to go… with all these wires sticking out the isolation of the wires looks really clean with those PCB’s.
But we really have no clue why EBoosted board exploded… but it just scares the hell out of me now!! I also have recently destroyed a Graphene 4s 6000mAh battery just started getting hot and seep liquid into its cavity. I am now being much much more cautious. Padding the crap out the batteries.
On my 12s4p pack - I am going the way @trampa Frank has. With tufnol sheath (1.5mm & 3mm) on both impact sides and a polypropylene shell and balance wires tucked away.
I haven’t series soldered the packs yet ( I was going to tonight)… so if you have some of those PCB’s for sale…please let me know !
- All my packs were balanced with a difference of 0.01 - 0.02V
- There was an additional layer of protection on the head of every cell.
- I applied 6 spot welds on every cell, job was mint
- No BMS was being used at the time of the fire
The theory of the balance wire shorting and causing fire is loosing weight as it happened to several people and that’s not enough to start fire
There must have been a bigger short, I’m leaning to be on the charging port, the port was a high quality Switch Craft, it could have been hitted by the last battery pack casing a short.
That’s the most probable thing so far.
In order to avoid this in the future, I’ll secure all individual packs from moving with some kind of stops and use more neoprene so each battery stays put and fits snuggly.
I used a Battery Support 60A BMS for only 1 month before it burnt out, the next 4 months I used the board with no BMS at all, however the balancing wires were still connected to each pack the BMS plug was there disconnected.
1 week before the roast I pulled up the enclosure and checked the voltage of each pack and the difference in between them was 0.02V maximum.
Glad you were unharmed 
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18650vused to have internal fuses but users demaned more capsity , so no space for fuses!!!b
You can still find cells with “CID” which is a current interrupt device which will “fuse” in overpressure situations.
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This is a good guess, charging port can be dangerous if exposed. I recommend protecting it with a small fuse. I have 4A charger and I use 5A fuse for it.
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Could we do this in another way? Maybe if we fixed the wire right next to the solder, to take away the strain from the hardened part of the wire when the pack is flexing. Maybe with glue of some other way of fixing it without harden. Sort of like this:
(the line from the solder on the lower drawing to the left should have been one dot further to the left 
)
That costumer service tho 
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No way to tell if all packs were balanced correctly because you have 4 cells in parallel and you read the voltage as a whole not from each individual cell. Could have been like this 4.3 (cell_1) 4.3 (cell_2) 4.3 (cell_3) 3.9 (cell_4). There could be multiple possibilities and maybe 1 or 2 cells where going bad and they got to low and boom fire. This is why you see people burning there house down trying to parallel charge 4 lipos at once and 1 or 2 packs has bad ir. Just a thought!
Actually, you can tell if you have a bad cell even when they are in parallel that way. If any one of the parallel packs is discharging faster than the other packs, you know have an issue within that parallel pack.
I had this happen a lot when my cell fusing blew on some groups. It would discharge and charge faster than the others. Makes sense though.
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Shit didint think about that. Its been awhile since I parallel charged lol
Is there any way to prevent that ? Like put the battery pack in some sort of fireproof pocket ? I know it’s possible to buy bags to put LiPos in when charging them. Why not use the same thing when mounting the battery on the board ?
I’ve seen nobody do that yet, I wonder if there’s a logical reason that I don’t see.
Because battery bags don’t contain fires, at best they redirect the flames so then there is less collateral damage. If you actually had a fire proof air tight container, you would essentially have a bomb, since all the heat and pressure will build up inside the enclosure until it reaches breaking point.
Here is a friend’s board I was borrowing. The LiPo pouch cells were damaged during a ride and caught fire in my apartment. Burnt a hole clean through the aluminum enclosure. An onboard battery bag is not going to achieve anything significant.
I am going to make those style pcbs and sell if interested
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