Just as a precaution I would highly advise just using one 18650 aw imr batt. They are the best, safest as well. Stacking batteries can lead to faces, tongues and teeth blown out.
Scare posts like this are helpful to no one.
I hate to disagree with you here, but there are many noobs to vaping who are confronted with choices about high voltage, sub-ohm, wrapping their own coils, stacking or not stacking batteries, etc. Most are looking for the most powerful vaping experience they can find to help them shed another old habit. Many often want to do it as cheaply as possible. While the potential for explosions may be low, those who have experienced it might say that a little prudence could have saved large chunks of their face. Putting a potential bomb up to your face holds risks whether slight or not, and a little education goes a long way.
Scare posts like this are helpful to no one, they are just ignorant. The likelihood of a major battery malfunction like this is about .00001%. So if you are going to caution someone, do it intelligently not like a teenager.
Stacked batteries have been used for years without a problem. If your APV has short circuit protect as all the newer one do, there is virtually no concerns in using stacked batteries. If it doesn't have short circuit protection, then stick with a single battery. Although even a single battery can malfunction but is extremely rare.
You take more risk by riding in a car in comparison to using either battery configuation.
Well, I'm not going to back up anything because I don't have the time to do someone else's research for them today. The OP is doing the right thing by asking, and whether or not any of us posting on this thread have personally experienced an explosion (I have not), he does deserve to know that there are inherent risks. What he chooses to do with that info is his own decision. It seems like the more useful advice is to know the risks instead of someone saying that they shouldn't worry about it, it's fear-mongering, etc.
I definitely have heard of other cases of batteries going thermal and that's partly why there are now standards (at least here on ECF) about how mods should be constructed. I even read HUGE argumentative posts here about them. Not everyone has been hurt in these events. If one chooses not to do their research and stacks counterfeit batteries (that they thought had protection), otherwise uses/charges them improperly, or does anything else risky, they are not only putting themselves at potential risk, but they are also risking the reputation of vaping in general. We definitely don't need that in the mainstream because it DOES become fear-mongering in the media. I don't want the entire vaping community to suffer because of ignorance. You are correct in saying that the rate of events has been low. Thank God. I truly believe that the few that have occurred have contributed to the safety that most of us do experience.
Is there a conferred advantage to using either 1 or 2 batteries in your telescoping mod? Someone out there in ECF land surely must know the answer to this. To the one who convincingly replies the answer, I will allow them bragging rights and bestow upon them the title of Most Honorable Vapenerd.
In variable wattage APVs like the VAMO there's a couple reasons to use stacked 18350s instead of one 18650. Either way, I suggest using a recommended battery bought from a reliable vendor. IMR batteries from Efest and AW are great. There are other options like Panasonic, Sony, ect. but be sure you are getting the right kind. When you stack batteries, you "marry" them, meaning from day one you only use them together stacked and charge them at the same time. This ensures the capacity and voltage output remains close.
The one big advantage of stacked batts in a VAMO is if you want to go above 11 watts. One 3.7 volt battery in a variable power device can be bumped up only so much. Around 11 watts is the highest I've gotten on my VAMO. Stacking the batts doubles the available volt output, so the VAMO can deliver up to the 15 watts that it'll let you go. Battery time before charging is also increased with stacking. Since the device bucks down the power instead of boosting like it has to do with one batt, less power is used. Also, stacking the batts allows the use of the VAMO down to when hit hits 6.3 volts total with no drop in performance. With a single batt, I notice a drop in power around 3.6 volts (still would be at 7.2 with stacked) so I can go longer before changing batts.
Personally, I prefer using a single 18650 in my VAMO, and recently un-married my batts used for stacking to use in my 18350 epipe since I no longer need to use my VAMO for 11+ watt vaping.
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A little off topic but just my 2 cents on the whole battery safety issue. I read a lot of group pages over on Facebook daily. I've come the the logical conclusion from ALL the posts read over the last few months that it's just a matter of time before there's a serious accident involving a modded APV.
Some young kid that has taken the counsel of their FB friends as the only research will push the limits of the parts they've assembled in the quest for "massive clouds" beyond their capability.
There's just so much misinformation and so much trust in "my friend says" and too many IDGAF attitudes to avoid disaster. JMO