Double stacking Itaste SVD 18350
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Unless you know how to match the battery life of each, to each other, and have lots of vaping experience.. forget it.
And ... if you have that much experience, you know better !
Your just asking for trouble, or accidents.
Just get some 18650's and enjoy it safely with about the same results
Anyone that wants a "safe" vape, does NOT stack batteries
Do a lot of research.
There are lots of threads about double stacking.
I know that's not what you wanted to hear, but ..........
And ... if you have that much experience, you know better !
Your just asking for trouble, or accidents.
Just get some 18650's and enjoy it safely with about the same results
Anyone that wants a "safe" vape, does NOT stack batteries
Do a lot of research.
There are lots of threads about double stacking.
I know that's not what you wanted to hear, but ..........
I'll give my 
too.
Although some mod manufacturers may say its ok to stack batteries, unless you are willing to follow a very tedious routine of matching batteries, marking them to identify them as paired for life, alternating the order they are put into the mod each and every time, checking the voltage coming off the mod and off the charger every time, etc, etc,....
Stacked or unstacked?
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. Sometimes, just because you "can" doesn't mean you "should".
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. Save your teeth and home, don't stack batteries.
Every battery authority will tell you to never stack batteries. A larger single cell battery will always be safer than using two smaller cell batteries together. Whatever slim benefit you could obtain from stacking batteries is not worth the risk to your health or your home.
too.Although some mod manufacturers may say its ok to stack batteries, unless you are willing to follow a very tedious routine of matching batteries, marking them to identify them as paired for life, alternating the order they are put into the mod each and every time, checking the voltage coming off the mod and off the charger every time, etc, etc,....
Stacked or unstacked?
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. Sometimes, just because you "can" doesn't mean you "should".
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. Save your teeth and home, don't stack batteries.
Every battery authority will tell you to never stack batteries. A larger single cell battery will always be safer than using two smaller cell batteries together. Whatever slim benefit you could obtain from stacking batteries is not worth the risk to your health or your home.
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Although as a side note if you are dead set on stacking... Educate yourself on RC Li-Po batteries, not the same composition but similar with similar risks though you can get anywhere from 1-6 cell Li-Po's and most are rated via a "C" rating, double the C and you have your amp limit. One thing that is coming out in the RC world is the advent of Li-Fe batteries which I expect to be moving to APV's within the next year considering all the apparent break throughs in safety they are seeming to find with them.
only one thing to add to what Slots, Baditude and others already said, but ...
big-time props to OP for asking about a "safe way"
big-time props to OP for asking about a "safe way"
Why does iTaste even mention the capability of stacking 18350's if it is such an opportunity for disaster? Seems the design engineers have done testing to allow this to be stated in the operation manual. just thinking....
Wouldn't count on it.
US made stuff has manuals that are basically written be the manufacturers legal department to protect the company from all sorts of liability suits. (Hold knife at handle only). China doesn't have - yet - gangs of ambulance chasers, so some of the stuff they write should be taken with a grain of salt.
Like the other posters said: 'Can do' may not always a be safe practice...
And the pics should be ample proof that a thermal runaway can do serious harm. But hey, surely YT has clips of fellas fooling around wih lit firecrackers... guess them dentists and cosmetic surgeons need to make living too...
Like Steamix said, don't count on it. China does not have the safety/regulatory groups like Underwriters Laboratories or other similar groups like the rest of the world has. For example: The second pic I provided above is from a fire caused primarily because the charger that came with a Vamo kit from China was not adequate for what it would be used for. It didn't help that the batteries that came with the charger were ICR batteries, which have a flamable chemistry which are well known to vent with flames when they go into thermal runaway.
http://www.e-cigarette-forum.com/forum/vamo/478891-warning-do-not-use-charger-batteries-come-vamo-18350-kit-pics.html
Early last year (and not to be picking on FastTech) overseas companies and US companies were including no-brand-name "mystery batteries" along with their mod kits. Upon further investigation it was determined that the batteries were un-protected ICR batteries which should never be used in mods. The US companies pulled their product when this was discovered, the Chinese companies did not.
To this day, FastTech sells un-protected ICR (Li-Ion) batteries along with protected-ICR batteries/IMR batteries/hybrid batteries. It is up to the customer to determine which battery is safe to use with their mod by carefully reading the product descriptions. Even then, it can be confusing to a knowledgeable person to correctly determine what a particular battery is. It is also necessary for the customer to have educated themselves to know which batteries their mod can use. I can't count how many ECF members purchased unsafe or inappropriate batteries or chargers from overseas vendors only to find they had purchased unsafe batteries or chargers for them. Only after they came on ECF and asked the more knowledgeable veterans here if they were safe batteries to use did they find out they were not.
Just because a mod kit from China has batteries and charger included with it, never assume it is the correct (or safe) battery or charger to use with that mod. When you can't identify a battery or charger, don't use it. It's not worth the risk.
Again, I'm not picking on FastTech. They sell a LOT of different products, and its not necessarily their responsibility to state whether that battery is safe for mod use. EBay and Amazon also sell un-protected ICR batteries because those batteries have uses and applications not related to mods. It is up to the customer to educate themselves to be able to identify what batteries/chargers they need and then make their purchases wisely.
Those uneducated about batteries incorrectly assume that the batteries that we use day and day out are completely safe to use. And in general purpose applications they are. However we are pushing these batteries harder than what a flashlight, laptop, or cell phone uses them. These batteries pack a lot of power, and they can be dangerous if not used appropriately.
Buy your batteries and chargers from a trusted vendor who caters to e-cig customers, such as RTD Vapor.
BATTERY BASICS FOR MODS: IMR OR PROTECTED ICR?
DEEPER UNDERSTANDING OF MOD BATTERIES
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Wow! Thanks for all the input about stacking guys. I have received the message loud and clear. DO NOT STACK!!! I am happy with the results that this mod is producing with a single battery. I was just curious about know because the manual said I could. Yes, I read the manual. haha. This was a good learning experience. Thank you again for all the information from all of you. Being new to the vaping i want to get the most out of this new mod. Knowledge is king and now i have that much more and can go on about my day without worrying about stacking.
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