Pairing of batteries,,, Cant find an answer
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I don't know the chemistry scientific specifics other than that's what I was told by someone that has been vaping for years and even makes mods so I do it. Maybe it has to do somehow with the possibility that you might use Batts C and D more often than A and B, so if you mixed them up they may no longer be equal in chemistry. Seems pretty much the easiest way for me to explain it.
Because there is variability from battery to battery, even within batteries produced by the same manufacturer. Even though they are manufactured using high levels of quality control, there is still some difference between the capacity of one cell and the capacity of what looks like its twin. One with a nominal capacity of 800mAh may have an actual capacity of 790, while its apparent twin might be as high as 830.
When the higher capacity "twin" sees that its lower capacity brother is getting low on his charge, he tries to share his charge and the results may or may not be exactly what you had in mind.
There are also minute differences in the exact amounts of chemical goo inside the battery, as well as potential differences in the battery's own internal resistance.
We using these cells in a high drain system that is capable of putting enormous demand on them. There are many variables involved, and all it takes is one of the cells to exhibit one bad value in any of the variables to cause problems. And, the lower the quality of the battery, the higher the probability that one of the cells does so.
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I know that it relates to the recharge life cycle. The method in which in was explained to me was pretty much how you stated this. Basically if C&D have been charged and drained 50 times and A&B have been charged and drained 10 times and you paired A and D you would have 2 batteries that are at different points in their recharge life cycle - therefore- potentially making one battery a weaker link that the other battery *MAY* feast upon.
FYI - The numbers 50 and 10 may not be far enough apart in the scheme of things to make a problem - I am NOT an electrical engineer. I only used these numbers to simply explain the information I was made aware of.
Most batteries do have this disclaimer for stacking from vendors and manufacturers.
Whether or not this can really cause an issue, I do not know. I avoid stacking as I just don't want to risk it and find a good battery and a few back ups on charge perfectly sufficient.
Sorry but I don't take anyones word with out logical verification of what they say I need proof
"Trust but verify" a great man once said
"Trust but verify" a great man once said
No problem. No need to say you are sorry. It's a good question that needs to be discussed alot in this forum. 
battery knowledge goes deep. i dont pretend to know everything, so i wont. i know the basics. every advanced vaper should. once you start digging, youll see that there much more than meets the eye in terms of battery knowledge. if you check out Basic to Advanced Battery Information from Battery University you can read all about lithium batteries.
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You go right ahead and do whatever you want, then.
But don't say you haven't been warned.
No need for apologies Burn14me. To each his own- I choose to avoid the potential situation since I see no need, at this point, to test out the information. I am sure many prefer to jump in and see what happens. Who knows, maybe the water is fine 
IBCR Media:10753790 said:
Warning received I am starting to understand more but these are all possibilities. Wen I drive to work there is a "possibility" I may wreck my car also it doesn't stop me from working
- There is absolutely no reason to stack batteries in a mod. For the majority of mods, this would be considered unsafe battery practice for the reason that the other posters have already mentioned. Stacked batteries MUST be paired - "mated or married" - to each other; and alternated in the order they are put into the mod with each use. They must be of equal age, equal voltage, and the same type of battery. Stacked batteries do not drain equally. The weaker one can discharge too quickly and then become hard-shorted, resulting in thermal runaway. That's a battery term that means when a battery can go hiss or boom. Avoid at all costs.
- There is absolutely no reason to stack batteries in a mod. Have I said that already? Stacking batteries does not add longer battery time, it only adds voltage. Unless your mod was specifically designed to use stacked batteries (and few actually are), it can not make use of 8 volts of power, in fact you might even damage some mods with that amount of power. Most are not designed for this.
- There is absolutely no reason to stack batteries in a mod. Is that sinking in yet? Using a single bigger battery is ALWAYS preferred to using two smaller batteries, for aforementioned reasons.
From E-CigsAdvanced:
- "The warning: Stacking batteries is not suggested- and hugely warned against. Stacking improper batteries can place a strain on the battery cell and cause venting and/or explosion. When stacking batteries, the risk goes up.
If you decide to ignore the above warning, do NOT ignore the following tips:
Never stack an old and new battery together
Never use a damaged battery
Test your batteries after charge to make sure they aren’t overcharged
Test your batteries after charge and then a rest for a couple days. Make sure they are holding the charge.
Always use a protected battery
High drain devices should use an IMR battery"
Vamo and Stacked Batteries
* Current wisdom is that IMR (safe chemistry Lithium Manganese) batteries are considered to be safer than protected Lithium Ion batteries, and IMR's are now recommended over protected batteries for use in mods for all applications. (reference http://www.e-cigarette-forum.com/forum/ecf-library/129569-rechargeable-batteries.html).
Under no circumstances use an un-protected Li Ion battery. Take a few minutes and learn the battery chemistry of the batteries we use in mods; it could save your mod, some fingers or teeth, or your home.
Battery Basics for Mods: IMR or Protected?
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Stacked batteries (or installing in series) are used all time In golf carts and other 36 volt systems without being "married" why then is it required for vaporizers
To demonstrate my example of variability within products made to the same specs by the same manufacturer, try this experiment.
Get two identical lightbulbs (incandescent, flourescent, halogen whatever) and put them into identical light sockets plugged into the same receptacle. Turn them both on and leave them on until they burn out. How many times have you ever seen two identical light bulbs in a bathroom vanity mirror both burn out at exactly the same time?
Get two sets of AA batteries and put them in two identical mini mag lights, turn them both on and watch. One is almost certain to die before the other.
Get two electrical motors and run them continuously until they burn up the brushes. One of the two is going to die before the other because even though they're made by the same company and to the same specifications, even with high degrees of quality control, there is always going to be variability between the two.
Get two identical lightbulbs (incandescent, flourescent, halogen whatever) and put them into identical light sockets plugged into the same receptacle. Turn them both on and leave them on until they burn out. How many times have you ever seen two identical light bulbs in a bathroom vanity mirror both burn out at exactly the same time?
Get two sets of AA batteries and put them in two identical mini mag lights, turn them both on and watch. One is almost certain to die before the other.
Get two electrical motors and run them continuously until they burn up the brushes. One of the two is going to die before the other because even though they're made by the same company and to the same specifications, even with high degrees of quality control, there is always going to be variability between the two.
IBCR Media:10754074 said:
I understand variances in manufacturing but doesn't explain safety concerns with running batteries in series
The batteries we use in mods were not designed specifically for our use in PVs. We are borrowing other technology's applications for our use. These batteries typically are used for flashlights or similar items. Our PVs place much higher drains on a battery than other devices comparatively. Therefore, safe battery practices are necessary to use these batteries within their safe limits. Going beyond those safe limits is when these batteries can become dangerous.
Lithium ion class batteries pack a lot of power into a small package, much more than the typical over-the-counter batteries from Radio Shack you use to power your radios or alarm clocks. Respect that power. And be safe.
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Baditude:10754202 said:
Now that is logical and I have better understanding now thank you
Yes, it does. I tried to explain it in layman's terms with my two previous posts.
Baditude has also.
Your Vamo is a high drain device. It is capable of putting enormous strain on those batteries, and they're not designed for that purpose unless they're IMR or hybrid chemistry. The two grey ICR batteries that ship with some Vamo kits are not safe even in single use, much less stacked.
They may work just fine for a while, but as they age (measured in charge cycles, not time), the less stable they can become and the more likely they are to misbehave when placed under the demands that your Vamo is capable of putting on them. The lower the quality of the battery, the more likely they are to misbehave. Pairing batteries of different chemistry and different manufacture only increase the probability of failure.
Unprotected ICR cells can explode. Unprotected IMR cells vent gases and enough heat to cause a fire. Unprotected hybrid chemistry batteries just die gracefully.
Go get one (or two) of those AW IMR batteries from RTD. They're not that expensive and we won't be reading about your unfortunate e-cig explosion incident in the morning news.
Or if you really want to fully understand everything but not go to school or read about it, you can use this method!
Batteries lose capacity over time/use. Say battery A has 10 cycles, battery D has 100 cycles. Battery D is rated at 900 mah but is now really 750, battery A is still around 895. Battery D will discharge at a different rate than battery A. This is not good, especially with batteries of chemistry that don't like over discharging. There are many other factors that come into play as well.
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