31–40 of 45 posts
Hopefully now people will realize that every battery powered laptop and phone on an airplane is a potential bomb.
https://www.faa.gov/about/initiatives/hazmat_safety/more_inf...
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>if the energy is allowed to be released too quickly Wasn't this the problem? That the kernel was drawing too much voltage from the battery, or something like that I read.
I'm no electronics engineer, but I don't think "drawing too much voltage" is a thing. As current goes up, resistance has to go down, so there will be a voltage drop across the battery terminals. That's my understanding, someone correct me if I'm wrong, or otherwise help clear this up?
Earlier quoted context omitted.
>if the energy is allowed to be released too quickly Wasn't this the problem? That the kernel was drawing too much voltage from the battery, or something like that I read.
I'm no electronics engineer, but I don't think "drawing too much voltage" is a thing. As current goes up, resistance has to go down, so there will be a voltage drop across the battery terminals. That's my understanding, someone correct me if I'm wrong, or otherwise help clear this up?
This being said anything short-circuiting the loop, can create a new pathway with less resistance (think molten metal, sparks etc). But modern batteries can send a lot more current then, magnifying the effect.
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This is certainly not the first such case and it's unlikely to be the last. I recall Sony having numerous recalls related to similar issues. It's the nature of dense energy storage media to run into problems if the energy is allowed to be released too quickly, but the characteristics of Li-ion do make it more conducive to cause these type of incidents. Battery university has a nice explanation of the typical causes h…
>if the energy is allowed to be released too quickly Wasn't this the problem? That the kernel was drawing too much voltage from the battery, or something like that I read.
Can this happen in theory ?
I'm not sure what the problem is. Maybe Samsung rushed it, maybe it's a defect in some supplier made component, etc I have no idea but it does seem rather unfortunate and kinda sad to see such a nice phone not only be effectively done but it likely caused a lot of brand damage to Samsung in general (lots of reports of airline employees saying Samsung Galaxy phones, not just notes, are not allowed which granted is probably a misunderstanding but the brand impact is there).
My wife currently has a replaced Note 7 and she absolutely loves it and hates that she'll probably have to give it up.
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It will be interesting if any major air carriers decide to ban the brand from flight. with regards to your comment the industry should strive to show otherwise and there should not be any reason to not be able to predict this type of failure occurring at the device level. there certainly have to be some telltale signs that are detectable
Im not talking about defects, but malicious tampering. I may not be able to get a bomb on board, but I sure as shit can short circuit a laptop battery and start a fire.
Seriously, no need to overblow the issue to add more security theater.
Hopefully now people will realize that every battery powered laptop and phone on an airplane is a potential bomb.
Hopefully now people will realize that every battery powered laptop and phone on an airplane is a potential bomb.
An unlikely-to-happen view from a different perspective - if other manufacturers' devices exhibit the same issue, we could probably, just probably, start having devices with removable batteries. The airlines could charge passengers to have the batteries stowed away in a "safe" condition (whatever it takes to keep them from catching fire even when isolated). I'm not the first to think about or wish for this. Many site…
Of course, the battery is not much smaller than the phone itself, and removing it exposes the terminals of the battery, making it easier to accidentally short circuit etc. - it's probably safer to leave the battery in the device where it's already contained in one layer of generally non-combusting material.
I wonder why, I mean, it's a battery after all. They've pulled off probably a hundred other phone designs and they aren't new to the market. What's particularly wrong with the Note 7 that they can't fix in a PCB or battery redesign?
They are probably going to kill the name and wrap fixed internals in new box with new name.
Earlier quoted context omitted.
I'm no electronics engineer, but I don't think "drawing too much voltage" is a thing. As current goes up, resistance has to go down, so there will be a voltage drop across the battery terminals. That's my understanding, someone correct me if I'm wrong, or otherwise help clear this up?
Resistance is a simplification of characteristic curves, which themselves are simplifications. You can easily get a voltage drop across battery terminals, you just have to put the battery in series with another battery. This is dangerous. You could also hook up an active current sink. Again, dangerous. There is nothing preventing the internal battery resistance from causing the terminals to go negative except for the…
Many devices where there are two AA batteries (TV remotes, etc...) usually have the batteries wired in series. They need to do it to get the voltage high enough for some of the components.
Additionally, many batteries are actually made from multiple smaller batteries wired in series internally. For example, some 9V batteries are actually just 6 regular 1.5V batteries wired in series.
Of course, in these configurations, they generally discharge at a similar rate.