Comparison: Battery life of dual vs single 18650 regulated mods for Newbies

[Completely Average]

No where near double? Do you understand there are two types of mods? Series and Parallel mods.....ring a bell?

Series mods use the mAh of one battery but adds the voltage of both batteries.
EX: Samsung 25R 18650 4.2V 2500mAh times 2 gives you in a dual mod only 2500mAh battery but 8.4V

Parallel mods usues mAh from both batteries and voltage of one battery.
EX: Samsung 25R 18650 4.2V 2500mAh times 2 gives you 5000mAh battery but 4.2V

That is all totally irrelevant. A series mod will actually last a little longer than a parallel mod.

I posted this earlier.

The equation is Wh = mAh × V / 1000

In series

Wh = 2000mah x 8.4/1000. = 16.8 Wh

In parallel

Wh = 4000mah x 4.2/1000 = 16.8 Wh

You'll get exactly the same number of Watt Hours from either battery configuration. (1 mAh is 1/1000 of a Wh)

Series tends to be slightly more efficient than parallel. Roughly 3% or so more efficient, so in practice you'll actually get more life out of a single charge from a series mod than you will a parallel mod using the same batteries in both.

 

[Completely Average]

Are talking you from personal experience?

It's basic laws of physics.

You're going to apply the same voltage to your atomizer regardless of it being 1, 2, or 3 battery configuration in your mod. If it's 1 battery then all of the voltage will be drawn from the 1 battery. If it's 2 batteries then each battery will supply half the voltage and the duration of a charge will last twice as long. If it's 3 batteries then each battery will supply 33.3% of the voltage and the charge will last 3 times as long.

Thinking that a 1 battery mod will last as long as 2 or more batteries with the same voltage being drawn from both mods defies logic. There is no math equation that you can come up with that arrives at that result.


And for the record, yes, I've got a 1 battery, 2 battery, and a 3 battery mod. Guess which one lasts me more than 2 days running a .5ohm coil at 30W. I can assure you that it's not the 1 battery mod. That one doesn't even last a single day.

 

[nyiddle]

Are talking you from personal experience?

Erm, no. As @Completely Average pointed out, it's true to the science (and it logically makes sense).

But also, yes. My 2 battery mod lasts twice as long as my single battery mods (specifically regulated ones), and my 3 battery mod lasts about three times as long as my single battery regulated mods. That's an anecdote, but I have confidence in the science which backs it up.

 

[edyle]

Just trying to understand this better. From what I have been told and what I have understood. Dual 18650's does not mean it doubles your battery life. It just doubles the voltage from 3.7 to 7+ volts? so if I have a regulated mod that is powered by two 2000mah batteries, it is only read as 2000mah and not 4000mah as one might assume.

If you vape at 30 watts on a mod powered by 2 18650 batts, you will get almost double the vape time as vaping at 30 watts on a mod powered by only 1 18650.

 

[battouter]

Ok, it seems like people have different opinions with vape times in a single and dual 18650's. Personally, it never made sense to me how a single battery would have the same vape time as a dual setup.

 

[battouter]

here's a simple comparison for all the newbies like me

 

[VapeGod]

Just trying to understand this better. From what I have been told and what I have understood. Dual 18650's does not mean it doubles your battery life. It just doubles the voltage from 3.7 to 7+ volts? so if I have a regulated mod that is powered by two 2000mah batteries, it is only read as 2000mah and not 4000mah as one might assume.

The OP asked specifically about single vs dual configuration battery life. Why did it turn into a parallel vs series debate?

Yes 2000Mah x 8.4V / 1000 series equals 4000Mah x 4.2V / 1000 parallel both 16.8 runtime... But compare either to the OPs question and it's 2000Mah x 4.2 / 1000 single 18650 would be 8.4 runtime.

Jesus. However the batteries are setup you'll double your life with two batteries over a single assuming same build and wattage setting especially on a regulated mod. If you start pushing more power since mores available then depends on your new setup but that's not a fair comparison if you're pushing more juice then the single cell unit.