Battery Voltage....3v and 3.7v

[wader2k]

Someone recently asked whether the difference between a 3V and a 3.7V battery would be significant to his vaping experience. I ran the numbers from a theoretical perspective and thought it would be good to share them here.

It's all about power. Power to the atomizer inside your carto to be specific.

Power = Voltage squared divided by Resistance.

Let's assume a Carto with a resistance of 2.5 ohms.

If Voltage = 3V then Power = (3x3)/2.5 = 3.6 Watts

If Voltage = 3.7V then P= (3.7x3.7)/2.5 = 5.48 Watts.

That's a significant difference in power to the atty!


In actual practice there are other factors that contribute.....and of course, YMMV!



ps. It's been awhile since I brushed up on my electronics background and I didn't have a calculator handy...feel free to correct any of the above! My feelings will not be hurt!

 

[Davo]

Looks acurate to me... I'll take more voltage any day!! If Adrenalyn checks in on this we'll get the absolute OK, she's and engineer extroidinaire!!

 

[markfm]

Looks about right. An 808 (V4L's VaporKing series) under load runs between 3.7 and 3.8V. The 510 family uses a regulated output at about 3.1V. I use a 2 ohm carto on a 510 to get about the same vape experience as a standard 3 ohm 808 carto on an 808 battery:

3.1x3.1/2 = 4.8W 3.75x3.75/3 = 4.7W

The downside of the 2 ohm carto, of course, is that I am drawing about 25% more amps than the 808 to get that same final power level. If I had a 280 mAh 808 standard battery and a 280 mAh 510 Mega battery, the 510 battery should last about 80% as long as the 808 if I ran them both in the 4.7 - 4.8W range (shorter run time between recharges).

(There's a long thread in the battery section, real measurements of battery output under load. Real-world vaping is with the battery connected to an atomizer, so the output voltage when loaded is key.)

 

[Adrenalynn]

Agreed with Mark. Another thing I'd add is, if we pretend the two batteries are identical, the 808's we have are 1C max draw. If the 510 is drawing more than 1C from the battery, it's going to hold a charge even less long, need more recovery time, and ultimately the lifespan of the battery will be shortened.

 

[wader2k]

Addy! What took you so long?

8^)

Good to see you around!

 

[Adrenalynn]

I'm kinda in-and-out. Just a squirrel lookin' for a nut.

 

[jamvector]

I'm kinda in-and-out. Just a squirrel lookin' for a nut.

Well get your nuts together and get your tail back online more often - I miss you!

 

[Davo]

And even a blind squirrel like me can find a nut once in awhile. LOL

I'm kinda in-and-out. Just a squirrel lookin' for a nut.

 

[wader2k]

Head nut right here.....

emphasis on NUT!

 

[dohsma]

I'd say nuts as in multiple

Head nut right here.....

emphasis on NUT!

 

[keyzygirl]

Thanks for the smile!!You guys are so funny.

 

[5cardstud]

Okay but a fully charged 3.7 volt battery let's puts out 4.2 volts, does that matter.

 

[sawlight]

Right, I'm going to throw in a few more wrenches also.
Hot off the charger a Li-ion battery is 4.2-4.3V and can take short discharge rates at 2c, not that I recommend doing so. They also are designed to cut off at around 3.5v.

Then you have to take into account voltage sag, a Li-ion will mostly operate at 3.7v and hold steady there. A lithium cell, might start out a 3v, usually 2.8v, then sags under a load to around 2.5v and continues to drop from then on to nothing.
So if you change the numbers to reflect actual power under a load it's even more of a drastic difference.
I'm a "flashaholic" in another life, I've had this stuff beat into my head! You can take an incandescent flashlight that runs on two CR123a batteries and replace them with a singe 17650 or better, a single 18650 and it will be brighter and run longer because it maintains voltage longer and better because it doesn't sag as hard as the 123 batteries. They also offer dramatic increases in amperage output.
Just some tid bits of info.

 

[Adrenalynn]

Depends on the Li-Ion battery. Ours can scarcely take a 1C hit. 2C is not gonna go over well.

We cut-out well below 3.5v. 2.8v typically.

A 4.2 or 4.3 depends how the charger is programmed. With our chemistries, a 4.2v max is all you want.

Wader - I always think of you when I step out back to vape and the squirrels are frolicking. Drives Thor! bonkers, because Darwin has dictated that the ones destined to reproduce have learned to stay in the tree that hangs over our yard but is on the other side of the fence. (JRTs can climb trees)...

 

[wader2k]

Addy. I'll admit I just awoke and had to google JRT.
I did not know they could climb trees, but I did see a Doberman sitting on top of an 8 ft stockade fence once.

8^)

Oh....and more squirrels. How about some pics of Thor?

 

[sawlight]

Depends on the Li-Ion battery. Ours can scarcely take a 1C hit. 2C is not gonna go over well.

We cut-out well below 3.5v. 2.8v typically.

A 4.2 or 4.3 depends how the charger is programmed. With our chemistries, a 4.2v max is all you want.

Wader - I always think of you when I step out back to vape and the squirrels are frolicking. Drives Thor! bonkers, because Darwin has dictated that the ones destined to reproduce have learned to stay in the tree that hangs over our yard but is on the other side of the fence. (JRTs can climb trees)...

I'm not referring to the V4L batteries Addy, I'm talking about the rechargeable's used in mods, the new IMR cells are getting claims of 3c!

 

[Adrenalynn]

I totally believe that, Saw! I have LiPo's that are 14C instantaneous. (For high current drain robotics)

Wader - very first shot I took with my new camera today (woot! for new cameras!)

And here's the puppy. It's Thor!, btw. The exclamation mark is built in. He needed his own exclamation mark to properly identify him.

 

[wader2k]

Nice shots! Thor! looks like a ton of fun!

 

[Adrenalynn]

Thor!'s my baby. Just turned 15 last month. My little Christmas Miracle.

Thanks! Not bad for pouring rain, new camera, new glass, and dusk. It'll be six months before we have a clear day again. Always happens when you get new camera gear. Six months for a clear night when you get new telescope stuff. It's a universal law.

 

[krazie_Kid]

Hey that was me lol, I tried the batt, and... Yeah it was not good at all. I returned it and got a 3.7 batt lol.