Vamo with protected batteries shuts off when fired above 6W

[Bunnykiller]

the info I found on the Efest 3400's
Flat Top Efest 18650 3400mAh 3.7V Li-ion Battery ?Non-protected)-Efest battery for E-cigs

what I find odd is that the protected version and the unprotected version have the same numbers on the case ( not the wrapper)


same battery but one has the chip??

 

[Baditude]

I have two mated pairs that I've alternated, the pairs are different in appearance (so not going to mix/match). What benefit is there to alternating the order? What trend should I be looking out for in measurements? I am intrigued, as this is supposed to be a protected device, and ICR are supposed to be protected batteries (I have not modified them, they are as packaged).
I am not arguing with you, but rather trying to see the WHY behind this... I am hoping this will garner a more detailed response than "it could blow up". I have over a decade of experience in electronics, but admittedly didn't work with batteries much in that.

If you are using battery pairs that are not exactly identical, then you are not using the matching process for stacking batteries correctly. The batteries must be exactly the same: same brand, same model, same specs, same age (preferably new).

In some mods, you can fit two 18350's when the mod is configured for an 18650. This boosts the voltage output from 3.6V to 7.2V which means more vapor. Yay. but, you should never do this. Unless you are familiar with matching batteries, you are only endangering yourself and others.

You may think, "Well, shucks, laptops have multiple batteries in them, why can't my e-cig?" Laptop batteries are specifically designed for stacking and are paired for use at the factory. When using un-matched batteries, they will discharge and provide current at different rates. This means one battery will continuously take more of the stress than the other.

You may not notice any trouble at the start, but as the batteries age with use the problem will become more severe. Push the batteries a bit further and now you've entered the realm of thermal runaway. Downside being that one battery entering thermal runaway will push the other battery into thermal runaway. Now you have two small, flaming explosives only inches from your face.

ICR batteries have a much lower C rating than IMR batteries, therefore have a lower amp rating. ICR batteries are a flamable chemistry, the very reason they have built-in protected circuits in them. Should that elementary IC circuit fail, a venting battery expells pressurized hot gas and flames.

IMR batteries are a safer chemistry and do not require the same IC circuits. They may still fail and vent gas, but not as dramatically as an ICR and without flames.

 

[Vapoor eyes er]

I have two mated pairs that I've alternated, the pairs are different in appearance (so not going to mix/match). What benefit is there to alternating the order? What trend should I be looking out for in measurements? I am intrigued, as this is supposed to be a protected device, and ICR are supposed to be protected batteries (I have not modified them, they are as packaged).
I am not arguing with you, but rather trying to see the WHY behind this... I am hoping this will garner a more detailed response than "it could blow up". I have over a decade of experience in electronics, but admittedly didn't work with batteries much in that.

Stacked batteries 2 yrs ago but stopped because:
- a major PITA- measuring, alternating, etc
- found one battery was loosing a charge quicker than the other which meant undo stress was being placed on one of the batts. This was after following all suggested safety measures.
- after the above realized the dangers of stacking.
Many don't realize the stress that vaping places on batteries which were never really designed for vaping.

 

[Vapoor eyes er]

the info I found on the Efest 3400's
Flat Top Efest 18650 3400mAh 3.7V Li-ion Battery ?Non-protected)-Efest battery for E-cigs

what I find odd is that the protected version and the unprotected version have the same numbers on the case ( not the wrapper)


same battery but one has the chip??

Efest is known to re wrap batteries as per the Flashlight guyz. Panasonic prolly the most prized batt line within the companies that re wrap/ resell.

 

[bsoplinger]

Since vv mods like the Vamo boost the output voltage up from the (nominal) 3.7 that the battery supplies and then uses pulse width modulation to regulate it to whatever is the desired voltage, I'm confused why stacking wouldn't be good. When unstacked, part of the current is used to boost the output voltage but that shouldn't be necessary in a stacked configuration. Seems to me this would mean less current would be used and isn't the amount of current being drawn the big consideration when talking about batteries in a mod? I seem to be missing something here

Sent from my Nexus 7 using Xparent Purple Tapatalk 2

 

[The Ministry]

I used to stack 2x18350 batteries in my Vamo V5 until I found advice on here.

If it's potentially unsafe and a PITA, then it's not worth it to me.

Too much can go wrong with it, from what I can tell. Better using 1x18350 and 1x18650 depending on the need. I never noticed a massive improvement in the life of the batteries stacked 2x18350 over a single 18650 so saved myself the hassle and ditched the stacking altogether.

Not to say more precise and organized people can get away with it, but I can't remember what I did yesterday nevermind which battery I put in first

I think people are just trying to warn people of the potential pitfalls and save some faces and/or some front teeth. It's a risk stacking batteries. I'm NOT and expert, far from it, but rarely see it advocated on here

 

[Mutescream]

Cool. It would appear that I am in the realm of "ok". Each pair is of batteries that are identical, but each of the pairs look diff from the other pair. Just picked up a multimeter and checked the batteries before charging (3.410v and 3.413v respecively), and both that I put in it were 4.201v. Numbering/rotating is not that big of a deal to do, so I give thanks for the pointers.

 

[Gixer2000]

Well that kinda of stinks. I read review after review and thought the batteries I got we're safe to use now they are questionable. I got the unprotected NCR18650B and now finding out they are ICR and not IMR. Damn