check out illumn.com for sony vtc4 or samsung 25r batteries - great prices, killer service = and excellent, authentic batteries - well worth it - it really ALL starts with good batteries
Need some safety advice
- Thread starter Tha Kave Mahn
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keep the faith sister - and great job double checking to be on the safe side!
some of my B&M guys are good and knowledgeable, some of them... um... not so much - one of the reasons that I value this forum so much (the other is the amazing community)
Sorry I posted the nano, it is the lemo 2 atomizer.. I am not at my best tonight... Thanks
I agree. The NCR18650B is only for very low wattage vaping.
But, the CID (current interruption device) and PTC (positive temperature temperature coefficient) protection devices inside the cell give it overcurrent and overtemperature protection without an external protection board. I'll be posting the test results soon but the naked cells shut down (dropped to a small fraction of a volt) in a minute or so at 15A, in a few seconds at 20A, and instantly when shorted. Continuous or intermittent short circuiting of the cell never brought it above 40°C. After removing the short the cells recovered in a few seconds and showed no damage in follow up discharges. During a continuous short circuit, the voltage dropped to almost nothing. This effectively shut down the cell and anything connected to it.
An external protection board would add low voltage cutoff protection though, which could be valuable for some users.
I don't recommend depending on this protection regularly though as it's only meant for use when other protection has failed. But, having said that, these are the safest cells I've ever seen. But I recommend never using them at higher than 6.8A, preferably 5A. And even if only pulsed I do not recommend using any build that results in higher than 10A, just in case the mod autofires or a mech gets its button stuck on.
[edited to clarify that I am talking about the NCR18650B battery above]
The NCR18650A handles more current in my tests, even though it seems to be rated to a lower current level than the B cell, but by just a bit. It is a 3100mAh battery though. I mention this battery only because it's often confused with the NCR18650B.
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It's complete understandable. I'm sure you have other things on your mind. Stay strong and vape on.
Im glad to hear your decision. Patience does pay off, when you get new batteries you will have great peace of mind and have saved some money. Even though you are using a regulated mod and not a mech mod i would recommend reading up on battery safety and ohms law.
Btw, your sigelei 50w v2 will fire down to a .2 ohm coil. Assuming you used a .2 ohm coil and maxed it out at 50w your mod would be pulling 15.81 amps from the battery. That leaves alot of choices in batteries for you. Get something rated 20 amps or more, you always want a buffer in the amps just to stay safe. Say you were pulling 20 amps from a battery with a rated continuous drain of 20 amps. Not a great idea pushing it to its limit imo. Good luck, stay safe, and vape on.
Stay away from Ebay. When I first started vaping there wasnt any known counterfeits of LGs or Sammys so I used to buy them from Ebay, but since theyve gained popularity means there is most likely fakes. Not a fact, but im sure people are doing it
The unprotected Panasonic 18650 3400mAh NCR18650'B' will not shut down at any amp load, they do not have any protection features.
The protection on the protected version of Panasonic 18650 3400mAh NCR18650'B' is extremely reliable and will trip at 6.475a to 6.522 amps every time.
If you're talking about the NCR18650 'A' no one else mentioned it.
I fail to understand why you brought up a battery that wasn't being discussed or even mentioned in a previous post.
Your detailed explanation of the NCR18650 'A' while accurate is possibly confusing to new members or those not familiar with batteries.
Didnt want to spend the extra money for vtc5's?
They have a 2600mah battery compared to the 2100mah life of the vtc4's. But seriously... I bought the vtc4's myself, and now wish i had spent the extra for the higher capacity batteries. You live and you learn. 
Didnt want to spend the extra money for vtc5's?
Dont feel bad, VTC4's are safer.
And a big thanks to @Mooch I finnally read up on your tests, and the results. Thank you sir for your time!
if these are the orange MNKE's, then YES, they are incredibly good batteries. They don't have the capacity of newer batteries, but they've got the power (20A CDR, 60A burst). They've always been pretty hard to come by, so we used to stockpile them before all the vtc's and samsungs and whatnot became available.
Throw out the panny and use the MNKE's until your new batts arrive.
I just ordered some new VTC4s myself. I chose them over the VTC5s, but price didn't have anything to do with it. The 4s will withstand a higher current draw than the 5s. If the extra capacity is useful to you, and you're certain you're not going to ask them for 20 amps, the VTC5s are a solid choice, along with the Samsung 25Rs at 2500 mAh. But I like the thicker safety margin.Didnt want to spend the extra money for vtc5's?
When you say "protected", do you mean internal to the cell or an add-on board or device covering the top of the cell, either added by Panasonic as a "value-added service" or the reseller? I only ask because how do you distinguish between the protected and unprotected versions of the cell if an external board or device isn't used? There is only one Panasonic NCR18650B in the catalog.
The NCR18650B cell has both a CID and PTC device internal to it for protection, same as the NCR18650A. The NCR17650A has no added protection above that offered by the NCR18650B unless it's an option added on after cell manufacture by Panasonic or the reseller. See this brochure for additional info: Dropbox - panasonic ncr18650b protection brochure.pdf
I have tested the NCR18650B and the cell protects itself when severely overloaded or short circuited, without an external protection circuit board or device, as it is designed to do. Both the A and B cell can of course have a protection board added onto it, like that which Orbtronic offers, for low-voltage protection and an added layer of overcharge/overcurrent protection.
On another note....
Arrgghh...I can see why you didn't understand my previous post, it was confusingly written. I brought up the A cell because it is often confused with the B cell. But the entire post except for that one line is about the B cell. I'll edit it to make that clearer. Thanks for bringing that to my attention!
I'll investigate this all A vs B stuff further though and look forward to any information you can offer that helps identify any differences in the protection between the two cells.
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