One 18650 vs. Two 18350

[jcap33905]

Looking to buy my first VV / VW device and the specs. said it takes one 18650 or two 18350 batteries. What is the difference, and does one setup have any advantages over the other?

 

[stevegmu]

What is the name of the device?

 

[anumber1]

I would go with a single 18650 over a pair of stacked 18350s.

You will have to use and charge the 18350s as pairs. When one of the 18350's gets tired, you will need to replace them both.

More run time will be realized with the 18650 battery as stacked 18350 will still only provide the same mAh of discharge as one. The voltage doubles when they are stacked but the amp limit and mAh will be the same as just one 18350.

If you are going to be using a standard resistance carto, you may want the higher voltage, but most vapers will not need it.

I am assuming you are looking at a Vamo or a Sigeli mod.

 

[Baditude]

When you stack two 18350 batteries in series (end to end), the voltage doubles but the mAh and amps remain the same as one 18350 battery. There is very minimal to gain by increasing the voltage from 4.2 volts to 8.4 volts in a regulated mod because it makes its own higher voltage.

You lose battery time by stacking, you get only 7 - 8 hours with two 18350 batteries. With a single 18650 battery you can get 20 - 25 hours on just one battery.

Plus there is a strict methodology requred to stack batteries safely, which I won't go into here.

 

[jcap33905]

Thanks for the info. I am looking at the Vamo V5 for me and wife. This is our first Vv /Vw device. Hope it lives up to my expectations. Think I will go with the single 18650.

 

[dr g]

There is little reason if ever to go with 2x 18350 vs 1x 18650. Battery innovation has been happening far and away the most at the 18650 cell size so you can get better performance and capacity out of a 18650 per cell size than any other size at this time.

As the others have noted, you gain no capacity when you run in series, or when you run in parallel, you only get 2x the capacity. Now there is a little to be gained by the modified current draws caused by these configurations, 7.4v nominal requires far less amperage than 3.7v nominal, and with parallel cells the amperage is divided between the two cells. However this does not make up for the nearly 4x greater energy in a 18650 cell.

 

[aikanae1]

When you stack two 18350 batteries in series (end to end), the voltage doubles but the mAh and amps remain the same as one 18350 battery. There is very minimal to gain by increasing the voltage from 4.2 volts to 8.4 volts in a regulated mod because it makes its own higher voltage.

You lose battery time by stacking, you get only 7 - 8 hours with two 18350 batteries. With a single 18650 battery you can get 20 - 25 hours on just one battery.

Plus there is a strict methodology requred to stack batteries safely, which I won't go into here.

That doesn't always appear to be true http://www.e-cigarette-forum.com/fo...-telescopic-users-group-307.html#post13867251
Based on this conversation, stacked batteries in some mods can increase the use by 2x or 3x's using the buck converter rather than boost. This is true with the Siegeli chip which I think is the same one Vamo and others use. It comes down to knowing your device but Siegeli and Vamo aren't misleading consumers when they claim their devices allow for using stacked batteries. In fact, stacking may be the most efficent use of power regulation in them.

Please correct me if I'm understanding this wrong.

I also assume anyone into sub-ohming is using a mech and none of this applies. Stacking would not be advisable and stupid IMO. I have zero interest in sub-ohming and I can think of a thousand things I'd rather spend a Saturday afternoon doing other than wrapping coils. Give me clearo's or give me death! LOL.