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Post by Deleted on Dec 8, 2020 12:29:39 GMT
Once the cell itself detached from the plastic casing it fell in the water. It sounded like it continued to burn underwater as there were some interesting noises one might expect from an ogre.
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Post by Telemachus on Dec 8, 2020 13:04:51 GMT
Once the cell itself detached from the plastic casing it fell in the water. It sounded like it continued to burn underwater as there were some interesting noises one might expect from an ogre. I’ve never met an ogre. well...
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Post by Deleted on Dec 8, 2020 13:12:19 GMT
Looks dodgy to me, sure its not your Mi7 past coming back to haunt you.
allahu akbar
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Post by Deleted on Dec 8, 2020 15:32:56 GMT
Looks dodgy to me, sure its not your Mi7 past coming back to haunt you. allahu akbar I was considering this but worried that if I mentioned it this may be libellous. You definitely don't want to defame MI7
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Post by Deleted on Dec 8, 2020 15:52:33 GMT
Yes, good point, don't want the forum to be shut down and D9 took out back..
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Post by Deleted on Dec 8, 2020 15:57:02 GMT
Yes, good point, don't want the forum to be shut down and D9 took out back.. It is possible that he is already brown bread.
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Post by Gone on Dec 8, 2020 16:07:03 GMT
Once the cell itself detached from the plastic casing it fell in the water. It sounded like it continued to burn underwater as there were some interesting noises one might expect from an ogre. I’ve never met an ogre. well... Very good at hiding, but sound just like a lithium battery burning underwater
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Post by Gone on Dec 8, 2020 16:10:27 GMT
Dreamliner type failure. When overcharged lithium battery emits flame. Would throwing water on one be a good idea or likely to make the problem more spectacular? Its odd as the input from the engine alternator was about 14v whereas the pack itself must be a higher voltage otherwise it would not work as a jump starter. I wonder if it had some sort of reverse polarity protection which also gets upset if device left connected. Or a dead short starts a chain reaction. I did use leads I made up which had no fuse and looking at pictures of jump packs there is a plastic module in the positive wire which probably is a single use fuse... It just goes to show how much energy there is stored in these little buggers, it was reasonably similar to setting fire to a bowl of petrol. The pack voltage only needs to be high enough to spin the starter motor, so about 12v after which it will be more than ready for a recharge .
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Post by naughtyfox on Dec 8, 2020 17:48:21 GMT
Nothing quite alerting MI5, is there? That's the quickest way to get Thunderboat shut down.
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Post by Jim on Dec 8, 2020 17:56:41 GMT
Nothing quite alerting MI5, is there? That's the quickest way to get Thunderboat shut down. Chortle. The blackest pot on the range!
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Post by Deleted on Dec 8, 2020 20:01:58 GMT
Its odd as the input from the engine alternator was about 14v whereas the pack itself must be a higher voltage otherwise it would not work as a jump starter. I wonder if it had some sort of reverse polarity protection which also gets upset if device left connected. Or a dead short starts a chain reaction. I did use leads I made up which had no fuse and looking at pictures of jump packs there is a plastic module in the positive wire which probably is a single use fuse... It just goes to show how much energy there is stored in these little buggers, it was reasonably similar to setting fire to a bowl of petrol. The pack voltage only needs to be high enough to spin the starter motor, so about 12v after which it will be more than ready for a recharge . I assumed it was a 4s but now you mention it it might be a 3s lipo pack so the 14v would indeed be significantly over its full charge voltage of 12.6v. Interesting ! My default assumption on this was that it would be a 4s in order to give a proper boost effect to the voltage of the battery but quite likely not the case.
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Post by thebfg on Dec 8, 2020 20:17:57 GMT
Dreamliner type failure. When overcharged lithium battery emits flame. Would throwing water on one be a good idea or likely to make the problem more spectacular? I did use leads I made up which had no fuse and looking at pictures of jump packs there is a plastic module in the positive wire which probably is a single use fuse... It just goes to show how much energy there is stored in these little buggers, it was reasonably similar to setting fire to a bowl of petrol. I'm no expert but the jump packs I have seen have some sort of diodes in, I believe they prevent a certain amount of power going back into the jump pack.
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Post by Deleted on Dec 8, 2020 20:22:44 GMT
This is what I was thinking as well. . Its not impossible for these to get left connected and given the spectacular nature of a runaway it would seem quite important to have safety features.
Other thing was impact damage but it only moved about a foot.
Maybe it's just a bad item.
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Post by Deleted on Dec 8, 2020 20:24:07 GMT
I did use leads I made up which had no fuse and looking at pictures of jump packs there is a plastic module in the positive wire which probably is a single use fuse... It just goes to show how much energy there is stored in these little buggers, it was reasonably similar to setting fire to a bowl of petrol. I'm no expert but the jump packs I have seen have some sort of diodes in, I believe they prevent a certain amount of power going back into the jump pack. That might be what the plastic module is in the original leads. However it is fitted with an Anderson sb50 chassis socket so there is always a chance of someone using the incorrect leads... This is the model But I don't think its available anymore. I wonder why that might be. Mind you if that rectangular red box is a diode pack to prevent charge-back occurring and I didn't use the original leads then... Maybe it is printed on the unit to always use the original leads.
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Post by JohnV on Dec 8, 2020 21:49:06 GMT
after the well publicised explosions on aircraft I was very wary of Lithium batteries it was only after I was convinced that the LiFePO4's were very safe that I jumped. What you have described makes me pleased I did. I know you get advantages with other types of Lithiums but the safety aspect weighed very much in my choice.
Not commented before but have been reading this thread with interest ..... am very pleased you were not hurt Andrew
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