My best guess its the turn signals amberwolf talked me into installing on the front of that bike short cirquited and caused a catastrophic fire.
You guys are playing with fire with this turn signal thing.
SO the bike was built with a metal plate at the bottom of the basket for the battery to strap to. Originally the battery was strapped in really tight and we only used one battery on the bike. But after a while we started switching batteries out on it, and each battery is a slightly different in size depending on whether it has corking protection around it or not.
So seriously my best guess of what happened is planning on taking the road route through the GG park i didnt take as much care strapping the battery down as I normally would.
The path through the frisbee park was a spontaneous detour. I dont think it is a coincidence that the bike burst in flames in the roughest part of the ride. The bike obv has no front suspension and the jarring up front must have been pretty severe.
I believe the battery jiggled loose from its strap and then hit one of the sharp edges of the metal plate.
I noticed when the fire intitially broke out that the battery was loose from its strap. I am not sure if the battery had bounced loose or burned loose however.
Justin had visited my house and we had taken an ebike ride a few days earlier and he had checked out the the battery packs. He commented that they should have a hard metal case of some kind to be safe.
He also said that from importing hundreds of many different kinds of chinese lipo he had no success on any pack and had just about given up. His comment was that until panasonic or sanyo or some company like that decided to construct a pack with bms, lipo packs would continue to be unreliable and unsafe and nearly impossible to sale to the general public.
Oh also...when a pack is constructed with BMS its very inconvenient to unwrap the pack from its shrink wrapping and check each individual cell. Everyone i know who rides with these packs basically just charges and rides with them and forgets about them. The BMS will usually shut down the battery when any abnormality occurs. I have thousands of miles on these packs and this is the first fire mishap. Of course i am taking much larger risk of fire since i ride about 10x as much as the average ES member i believe.
Also liveforphysics had warned me in an earlier post that he had tested these battery space cells and they are the most dangerous cobalt chemistry he has ever tested. Now I see what he is talking about.
I think a better quality cell may have just fizzled a bunch of smoke which wouldnt have been nearly as fun.