Recent content by jerry i h
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Can't decide between flashlights
In true CPF tradition, suggest you buy all 3. Then, tell us which one you prefer. :devil:- jerry i h
- Post #2
- Forum: Recommend Me a Light For...
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just got my Klarus MiX6 Ti
Re: EDC report - very nice indeed sorry to resurrect an old thread, but here is an update. this has been on my keychain for over a year. when I first put it on my keychain, I put one of those L92 in it. **unlike the Illumina or ITP, the head is still super easy to twist. no detectable thread...- jerry i h
- Post #10
- Forum: LED Flashlights
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lecture on lithium cell internal short-circuits
I found this nifty lecture titled Lithium-Ion Battery Safety Study Using Multi-Physics Internals Short-Circuit Model at this link (opens PDF file): http://www.nrel.gov/vehiclesandfuels/energystorage/pdfs/45856.pdf Sadly, these are only the slides. It takes some patient study to understand...- jerry i h
- Thread
- Replies: 0
- Forum: Flashlight Electronics - Batteries Included
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Boeing 787 & Li-Ion batteries vs recent fires
Great link: primer on the electrical system of the 787. I noticed with great curiosity on page 4 that the 777 uses a NiCd battery pack but at 24 volts. I calculated that a 32v one would be about 35# more, about one carry-one and golf bag full of clubs. I was about to question the wisdom of this... -
Boeing 787 & Li-Ion batteries vs recent fires
Hallelujah. Where that one of the Boeing engineers understand that. As far as I can tell, Li-ions will, a small % of the time, spontaneously vent with flame, no matter what you do. Boeing, rather than choose a different, safer technology, are stubbornly staying with the same solution, but add... -
Boeing 787 & Li-Ion batteries vs recent fires
This is an interesting article, describing the (unsuccessful) efforts at putting out a lithium fire in the 787's lithium-cobalt battery pack with conventional fire extinguishers and water. -
Boeing 787 & Li-Ion batteries vs recent fires
From this link: NTSB still seeking root cause of Boeing 787 fire OK, anyone care to explain? -
Boeing 787 & Li-Ion batteries vs recent fires
Beg to differ: being insufficiently developed is not the problem. The problem is that some goofball engineers want to take advantage of high energy density, but refuse to consider that a small % will spontaneously vent with flame, no matter what you do. -
Boeing 787 & Li-Ion batteries vs recent fires
I looked carefully at the photos of the battery pack, and they seem to be all simply wired in series, w/o any sort of wiring so that each cell can be monitored independently. FAA likely to OK Boeing battery testing in days - sources :sick2: I find it disturbing that Boeing's solution is to... -
Boeing 787 & Li-Ion batteries vs recent fires
Re: Battery Fire NTSB Briefing - JAL 787 Uh-oh... U.S. Officials Fault F.A.A. for Missing 787 Battery Risk seems that the Boeing engineers did not bother to tell the FAA that LiCo rechargeables have a bad habit of venting-with-flames, and that this can spread to the next cell that it is... -
Boeing 787 & Li-Ion batteries vs recent fires
Re: Battery Fire NTSB Briefing - JAL 787 In the McMaster catalog, I found this interesting thing: Lightweight Quick-Charging Lithium Batteries It looks similar to the 787 cells, but of course this might just be coincidence. Anyone know what's inside? I am hoping that it has plates, since it... -
Boeing 787 & Li-Ion batteries vs recent fires
Re: Battery Fire NTSB Briefing - JAL 787 :crackup: I mean... :poke: anyway, wait just a doggone second: Is he claiming to be an expert in battery chemistry who has done this before, gave custom specs to GS-Yuasa, and that they made the li-ion cell to his specs? It seems more likely that he... -
Boeing 787 & Li-Ion batteries vs recent fires
Re: Battery Fire NTSB Briefing - JAL 787 From an article in FlightGlobal : ummm...those of you engineers, sounds like one of those non-answer answers you give at a dog-and-pony shows where you get an uncomfortable or inconvenient question? In any event, Elon Musk's Dragon9 space shuttle that... -
Boeing 787 & Li-Ion batteries vs recent fires
Re: Battery Fire NTSB Briefing - JAL 787 Oy... -
Boeing 787 & Li-Ion batteries vs recent fires
Re: Battery Fire NTSB Briefing - JAL 787 Here is very cool CAD drawing of the battery cluster, including the internal construction of the Li-ion cells. Here is a very interesting picture showing the battery pack cover. Most press photos cut-off the covers at the bottom of the photo. I did not...
