Safe or not ?

[jaysey]

www.vapeescape.co.uk/Vaping-Spares/Li-Ion-Batteries/Efest-Protected-Batteries.html?cPath=
Following on from another thread are these safe to use in a mech mod ?
Is the same caution needed as using unprotected or should they be avoided as more risky ?

[Super-Shiny]

Safe

[charon]

jaysey Like the master has said....Safe.

The clue is in the product description really Efest Protected Batteries

[jaysey]

Jun 6, 2014 19:55:02 GMT charon said:

jaysey Like the master has said....Safe.

The clue is in the product description really Efest Protected Batteries

[br ah but read the thread in beginners section about mech mods ,,,,,, apparently these are not recommended now !

[charon]

jaysey Been using for ages as they are the only 18350 that gives me the longevity I want. Charge ok and hold charge well.

I can only speak as I find. Never had one vent and never had a heat problem, Just a case of use with care and as always be aware of your wattage etc.

[Ripshod]

As far as I'm away the purple 350s from efest are okay.

[VapingBad]

Opinion is divided, the downside of protected batteries is that it is to protect you from a more volatile battery that if the protection fails is more dangerous than an IMR/safer chemistry battery. The protection like anything in this world can fail so the worst case is more serious with these. They are safe to use in a mech if you are not using a low resistance coil, but with the booming popularity of sub-ohming in recent years they have gone out of favour as there aren't able to supply the high current that IMR/safer chemistry batteries can and if they go postal they are far worse. The protection will only cut the circuit to the positive terminal so can't protected against internal faults or physical damage.

With IMR/safer chemistry batteries you are the safety device in terms of not over discharging your battery, preventing shorts and monitoring temperature. But if you fail in this the consequences are milder as they would vent much gas (and very unlikely to vent liquid) so less likely to go bang or make your mod go bang. They don't vent flames like other lithium can and they don't go into un-arrestable thermal runway (when the cause is fixed they stop getting worse). Manufactures could make protected IMRs very easily, but none think that's needed.

If you are or plan to sub-ohm you need IMR or hybrid batteries that can supply the current, the protected ones will trigger the protection to cut off.

Personally I only use IMR batteries for safety reasons, very rarely lithium batteries go bad when not in use and if that happened there is less chance of a fire being caused by an IMR/safer chemistry battery. I wish the other cylindrical ones would be phased out as IMO its a risk that can be easily avoided they are cheap old tech that should be history. Its a bit like hydrogen & helium in air balloons, but nowhere near as big a difference between the two.

This is my opinion after reading many other opinions and I am not an expert.

[VapingBad]

Jun 6, 2014 20:12:10 GMT Ripshod said:

As far as I'm away the purple 350s from efest are okay.

ronaldo said he has seen lots of faulty ones, not sure which sizes.  Also I hate the way Efest have re-wrapped a 20 A LG battery and marketed it as 35 A: the purple 18650.

[Ripshod]

That's one of them. Out of the purples only the 350 was proved to be right, others the maximum load was quoted too high or had other faults. The range linked to here by the OP are definitely not what they say on the wrapper.

What happened to that guide hijack was working on?

Found it, nvm

[ronaldo]

loads of 18650 loads and loads and a few 18350 I wouldn't trust purple ones for a while until they get there house in order

efest know about the dodgy batteries so they should do something about it I know a new batch is getting sent to my works so I will be getting them to test and will report when I know more

[Ripshod]

Thought I was going mad for a mo, thanx ronaldo.

I've just read hijack's last post - looks bad for me he's used virtually the same words as me, only before me

[ronaldo]

Jun 6, 2014 20:49:10 GMT Ripshod said:

Thought I was going mad for a mo, thanx ronaldo.

I've just read hijack's last post - looks bad for me he's used virtually the same words as me, only before me

no probs m8 efest should be back to normal soon but it will be impossible to tell the difference visually between them so I wont buy none for a long time but will get some from work after testing

[hijack]

Ripshod I have efest purples as well the 350's 500's and 650's with the misrepresented wrong labelling. Although I don't use sub Ohm and stay well within what I believe is the real limits of the battery.
I had no idea about other faults with them, maybe ronaldo can link me to a thread or let me know what these faults are?

[ronaldo]

Jun 6, 2014 21:22:48 GMT hijack said:

Ripshod I have efest purples as well the 350's 500's and 650's with the misrepresented wrong labelling. Although I don't use sub Ohm and stay well within what I believe is the real limits of the battery.
I had no idea about other faults with them, maybe ronaldo can link me to a thread or let me know what these faults are?

right I am an electronics engineer design and maintenance

our works got in about 1000 purple efests for testing purposes

I personally tested 120 of them and I know I done my job right as people that know me well will confirm I am thorough

over 20 of them had not enough chemical in them so it made them very unstable and I think it was 46 was not the power rating that was stamped on them they were a lot lower I cannot give you a link as I was the tester and I value my job to much  

[Ripshod]

It'll take a while to gather my sources, it's a big list. I'll do that if I need to, but I'll add that the maximum safe load (current or amps) was reported a lot higher that it was actually tested to be as well