Not necessarily.
For example, for 26650 batteries I use black liitokala 5000mah and I am very pleased 
And so far we have had lots of batteries from the liitokala stores and I have no problems.
I will buy from this site. Are they original?
What do you recommend for Astrolux MF04? I saw samsung Q30 and has 15A drain. Q30 does not have a 20A drain?
The Samsung 30Q is oficially specified for up to 15A continuous, but independent tests have revealed it also does nice at up to 20A. Samsung cares about cycle life and is spec conservative.
As far as my experience goes with them all NKON sells is genuine.
Cheers :-)
Sorry 30Q
30Q - 15euro
Sony VTC6 - 29euro 
I buy 30Q. At the torch I need 4 pieces. Will I buy 4 pieces or will I need 1-2 pieces to reserve (if it explodes)? Thx 
How do I know what a battery discharge using a XHP35-XHP70 at full power?
Murata/Sony hype. They're expensive and overrated. 
Too sparse information, Coman. Speaking so little makes it harder to provide you with useful information.
What flashlight?
To know the current draw it can help to think in power terminology. What amount of power?
In any case, if we are speaking about an Astrolux MF04S or thereabouts it'll probably fed ≈55 - 60W to the emitter and maybe take up to 70W from the batteries to do it, which is less than 20W per cell and 6A at most. And I mean at most. I do neither own nor possess first hand information of such torch, thus you may want to wait for another opinion if this is the case.
Those cells won't explode.
Cheers ^:)
Sun, 12/09/2018 - 13:13
I know, i have 10+ 26650 black liitokala 5000mah. Liitokala doesn’t deceive about this 26650 and use their own brand as wrapping. Now they are scamming customers by wrapping fake branded cells with their stickers.
Astrolux MF04. Finally I bought 4x samsung q30 = 17euro (including shipping) (from nkon.nl)
Good luck!
LOL… I love you man 
Nothing will explode but you could over discharge it (by your fault or if it accidentally turn on while in flashlight: lets say in backpack where you don’t see it, or even faulty charger - it can also over discharge cell) or you could overcharge it (charger failure - my charger charged cell to more than 5V once and it did not explode).
So precaution measures for unprotected cell are:
- If you’ll put it in a backpack(or similar situations without your control) than lock off tailcap switch(only if flashlight have anodized threads) or remove 18650 cell completely for piece of mind.
- If your charger charges longer than usual or indication light starts blinking or if it does not work at all just toss it in a trash cause it will “eat” your precious cells
- When you use it in flashlight lets say in driver without over discharge protection. Put it on high or turbo mode and if it is visually much lower than it should be than stop using that cell and swap to fresh one.
They are much better than protected cells imho cause they have 2 mini electronic pcb less to fail
Thank you man.
I took with PCB because I read that they are safer, I have about 5-7 panasonic pcb (liitokala) 3400mah, all works, I have for more than a year. But the new MF04 does not work as being too long (67-69mm), and I need unprotected batteries because they are 65mm (perfect for MF04)
Seriously? There are better ways to check out if a charger is working properly. Just after acquiring any given charger there are easy ways to test its maximum charging voltage like testing it no-load while powered on or just letting it raise a small and/or old cell to max voltage while watching.
With regards to checking out battery SoC, if you're finicky grab some handy sensitive lcd voltmeters you can take away like these: 0.28" 3-Digit LED Voltmeter Module (4-Color / 4-Pack) @ FastTech
Cheers ^:)
Barkuti,
I know how to test charger with DMM.
But if you want to say that above written is not ok and that people that are rather new into this hobby should check your way than I support you
Update.
After 3 cycles in MC3000, individual in the same slot.
Charge at 1.50A, termination 0.04A.
Discharge at 2.00A, cut 2.80V.
Internal resistance between 35 and 48mR.
Capacity between 2855 and 2993mAh.
Conclusions:
Fake 30Q.
Good capacity.
No high current uses.
I would not use them in series.
In spite of everything, I would not consider a bad purchase.
If they did not have the Samsung INR18650-30Q wrap they would have received 5 stars.
They received 
If the seller uses the nomenclature NCR18650B or INR18650-30Q (for instance) then I believe PayPal will still help you, espcially if the word “Genuine” is in there. They did for me however they messaged “Due to the uncommon nature of the complaint, PayPal has chosen to find on your behalf and refund your purchase. The seller will not be charged for this claim”.
I believe the seller *should be charged for selling fakes* although I am glad to be reimbursed without trying to get the cells back to China for return (not feasible). All this the sellers know and exploit.
Bottom line, I have had only one batch of fakes from Gearbest or Banggood. It was an order of NCR18650PF from Gearbest. GB refunded $10 of my $44 order which I disagreed with but I could acccept that or send them back.
I will skeptically now buy from GB or Banggood but in most cases I will buy from Illumn or Liionwholesale here for a little more per cell and keep my sanity.
I believe the more people take the chance for a good deal on Aliexpress and others, the more it fuels the counterfeit market.
I am done with Aliexpress forever.
In this sea of fakes I guess I should give the Aliya’s store a shout out for actually delivering on their promise
https://www.aliexpress.com/store/product/Free-Shipping-4PCS-lot-3-7V-18650-NCR18650B-3400mAh-Protected-battery-for-Panasonic/1382210_32514895471.html
Order arrived after 2 weeks, the tracking never went live though, can’t complain since it was fast.
Bottom pcb makes it quite tall, but it still fits in an S2+
Cells were tested and all were within spec.
Cut off voltage was about 2.4v, I ran one down and tested voltage every 30 minutes until the protection tripped and the multimeter read 0v.
Protection reset upon placing in charger. Ncr18650b spec is down to 2.5v so its a last ditch protection, best to stick to recharging based on the s2+’s warning at 3v.
Still waiting out my paypal dispute with 192led’s fraud.
Glad you found honesty in AliExpress. 
I wouldn't worry about the low protection cut-off, that is really a no issue. So much is said regarding this over discharging thing but that is all baseless hearsay. Go find me a source with actual testing evidence in this respect. The high voltage accelerated aging, nonetheless, is a known verified thing.
So you went PayPal dispute with 192led without even waiting for any sort of possible delivery period, did the seller said anything?
I ordered a couple Lii-100 chargers from 192led a month ago or so. I was to at least wait 2+ months. I say this because in eBay, for example, super cheap items ship with super cheap shipping and those orders are generally set aside during Xmas time due to the much increased postal traffic and plenty of priority shipments.
Cheers ^:)
192led is a fraud.
Paypal just told me there is no answer from them and refunded what I paid.
I just go by the spec sheet. For example, the Samsung 30Q says not to recharge a cell if it has dropped below 1.0v. Between 1v and 3v, charge slowly at first. Above 3v, go wild! (Okay, actually it’s max charge of 4A, with 1.5A recommended.)
So, yeah, a protection circuit that kicks in at 2.5v is more than okay.
Ah well 192led is well past the point of proven dubious, their live chat doesn’t even work. The search result is deprioritized on google, and the store ratings are likely fake. Delivery period is already past a month, never mind the other reports of fraud.
The low voltage protection isn’t for me, but for others I gave flashlights to. You have to ignore the convoy low voltage blink for hours before its a problem, but I guess it will save you from accidental activation inside a bag.
Funny thing about the liitokala engineer 500 I always forget, after the nor capacity test the thing doesn’t recharge the batteries, and then I wonder why the cells are so dim lol
Whereby? The NOR test cycle is charge + measuring discharge + recharge. At least that is what mine does (and I always pay attention to avoid full recharges LoL). 
Cheers :-)