http://www.e-cigarette-forum.com/forum/announcements-rules/76078-exploding-mods-current-situation.html#post5146201We have received reports that the most serious mod explosion yet has just taken place. The incident is unconfirmed as we have not seen any photos or other evidence, but several members have reported this as true.
A metal tube mod exploded in the user's face, causing serious injuries, with the result that the person was in the ER on breathing assistance.
This situation is not acceptable because someone somewhere has failed. We don't think it is us because we have worked very hard to convince the mod makers to do something about this, and to warn buyers of the dangers. However, clearly something has gone wrong.
We do not know the full story but this is what has been reported (it may be incorrect):
The product involved was a metal tube mod
It may have had no gas vents
It may have had no blowout plug at the bottom
The batteries were two Li-FePo4 stacked
The batteries had just come off charge and this was the first use
They may (this is not known) have been a cheap brand with an insufficient C rating
το εχουν βγαλει ανακοινωση στο ecf
εν ολιγης λεει για οσους δεν γνωριζουν αγγλικα
εχουμε ανεπιβεβαίωτες πληροφοριες οτι εγινε εκρηξη σε ενα mod
δεν ειμασταν μαρτυρες,αλλα πολλα μελη μας δηλωνουν οτι γνωριζουν το περιστατικο
ενα μεταλλικου σωληνα μοντ εξερραγη στο προσωπο ενος ατμιστη με αποτελεσμα να καταληξει διασωληνομενος στην εντατικη
αυτα που ξερουμε(οχι σιγουρα)
ηταν μεταλλικος σωληνας
μαλλον δεν ειχε αγωγους διαφυγης αεριων
μαλλον δεν ειχε βαλβιδα(?) εκτονωσης
ειχε 2 Li-FePo4 μπαταριες εν σειρα
οι μπαταριες μολις ειχαν βγει απ το φορτιστη
κ μαλλον ηταν φτηνιαρικες με ανεπαρκες c rating
edit γραφει κ αυτο το ενδιαφερον,εξηγει βασικα τα περι c rating
C rating explanation
Example: a battery is marked as 500mAh. Its maximum discharge is given as 500ma (half an amp), and this means it has a rating of 1C, and that rating is 0.5 amps (1 x the capacity). All these are the same thing.
If they don't give the C rating by that name, it is the maximum discharge rate.
A standard Li-FePo4 cell has a C rating of 4C to 10C. That means it can safely supply 4 x the capacity or higher, if demanded. So if the battery has an advertised capacity of 500ma, and is rated as 4C, then it can supply 2,000ma or 2 amps (1 amp = 1,000 milliamps).
If it has a 1C rating then it can supply 500ma or 0.5 amp or half an amp. This type of Li-FePo4 is of obviously low quality and should clearly not be used in an e-cigarette,
since an atomizer or cartomizer will commonly require between 1.5 amps and 2.5 amps. Asking a cell to supply 3x to 5x (!) its designed load is not safe. Stacking 2 cells and asking it to deliver 5x the design load is not only unsafe, it is going close to the edge. Placing that set-up in an unvented metal pipe is demonstrably unsafe.
Please try to understand the maths behind these common purchase decisions, some vendors do not understand battery systems engineering and cannot protect you - you have to do it yourself.
λεει βασικα οτι αν μια μπαταρια(για τις Li-FePo4 λεει) με ανεπαρκες c rating(ας το εξηγησει καποιος ειδικος) μπει σε σειρα με μια αλλη,αναγκαζεται να αποδωσει πολυ πανω απ τις δυνατοτητες της.
κατι πολυ επικινδυνο, και σε ακραιο βαθμο μαλιστα
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