Question concerning batteries for mods

[masterofthehouse]

First post!

I am considering getting an iTaste SVD after vaping with eGo batteries for about 2 months now and I had a question about which batteries to get.

Most of the recommended batteries from different threads around this form have a nominal voltage of 3.7V. Most VV mods I have looked at can output voltages up to 6.0 V. Does the batteries' nominal voltage limit this output voltage of the mods? Or am I missing something here?

 

[Choc_Addic]

Does the batteries' nominal voltage limit this output voltage of the mods?

Simple answer is No.
Mod's circuit boost the out put according to what you select and when the Voltage is low, it will be cut off.

My best advice on this is obtain the best battery for your mod. AW, Pana, Samsung etc are recommended cells. Avoid XXXfire branded or no brand.

Cheers

 

[masterofthehouse]

Thanks for the clarification!

 

[FireMan7209]

Hi MOTH (MasterOfTheHouse), My first post here as well. Sorry about the nickname there; just picked up on the first letters of the words in your screen name. To answer your question ... don't know this for a fact but I'm pretty sure the electronics have a "Boost Regulator" built in. The effect is the same as using a transformer only it's done through silicon instead of copper. It can take a lower voltage and up-convert it giving you 6 volts from a 3.7 volt source.

 

[WarHawk-AVG]

First post!

I am considering getting an iTaste SVD after vaping with eGo batteries for about 2 months now and I had a question about which batteries to get.

Most of the recommended batteries from different threads around this form have a nominal voltage of 3.7V. Most VV mods I have looked at can output voltages up to 6.0 V. Does the batteries' nominal voltage limit this output voltage of the mods? Or am I missing something here?

You get two 3.7vdc batteries (the 18350's not the 18650's) two together mean the voltages are added, control circuitry inside allows it to regulate down to lower voltages not vice versa

Once you get the voltage OVER the required regulated voltage...its really easy to use a LM7805, and a digital potentiometer COM-10613 to then regulate the voltage incrementally (there is a little bit more to it...but with the CHEAP electronics coming out of China...they build a controller that takes that 7.4vdc of two Li-Ion batterys and restrict it thru integrated circuits down to required levels at the push of a button)

Welcome!

 

[Choc_Addic]

That is correct.

But without going into nitty gritty of what to do and when...... Use the set it for forget (VW) feature of the device.

Also I advice that you do not stack (use 2 batteries), use one 18650 or one 18350(short tube). Using 2 batteries in stacked mode require much caution as it may reverse charge on itself and vent. Not a good thing.

You will love it.

Cheers.

 

[WarHawk-AVG]

They could be stepping it up...but I don't see how without some sort of transformer or whatever...

 

[BigBen2k]

H...the electronics have a "Boost Regulator" built in...

Close enough

It's actually a buck-boost regulator (a combination of Buck, and Boost). The Boost, obviously, raises the voltage, if you set it higher than what the battery is providing, and the Buck, lowers it, if set below the batt voltage. It's also dynamic, so even as the battery voltage drops, the output remains to what you set it to.

You probably don't care, but there's a wide range of efficiency in these regulators. Most modern ones will hit a 95% (peak) efficiency. Older designs could fall as low as 65%. (translation: dirt cheap is bad )

 

[BigBen2k]

You get two 3.7vdc batteries (the 18350's not the 18650's) two together mean the voltages are added, control circuitry inside allows it to regulate down to lower voltages not vice versa

Once you get the voltage OVER the required regulated voltage...its really easy to use a LM7805, and a digital potentiometer COM-10613 to then regulate the voltage incrementally (there is a little bit more to it...but with the CHEAP electronics coming out of China...they build a controller that takes that 7.4vdc of two Li-Ion batterys and restrict it thru integrated circuits down to required levels at the push of a button)

Welcome!

Yeah, that's the old design I was talking about

 

[WarHawk-AVG]

Close enough

It's actually a buck-boost regulator (a combination of Buck, and Boost). The Boost, obviously, raises the voltage, if you set it higher than what the battery is providing, and the Buck, lowers it, if set below the batt voltage. It's also dynamic, so even as the battery voltage drops, the output remains to what you set it to.

You probably don't care, but there's a wide range of efficiency in these regulators. Most modern ones will hit a 95% (peak) efficiency. Older designs could fall as low as 65%. (translation: dirt cheap is bad )

Nice..learn something new everyday...thanks!

Pow...here ya go!
http://www.linear.com/product/LT1070

Incredible what they have done with semiconductors!

 

[Thrasher]

you want batteries called "high drain"
AW, panasonic, MNKE, and sony are some of the best right now.

for example the mod will take 3 amps at 3.7 volts and convert it to 4.5 v at 2 amps (not accurate)

High drain IMR batteries are rated at 10 amps (or higher) usually and most mods ask that you use them for best operation. most mods have a limit of 3.5 to 4 amps before cutting off but by using the high drain batteries there is plenty of room for safety without stressing the battery.

have to be careful as some batteries have several models under the same model number and the only way to tell is the last letter.

panasonic "b" is a regular battery, the same model with a "p" on the end is a 10 amp high drain.

 

[BigBen2k]

That's pretty much the idea. This one (LT1070) operates at 40 kHz (40'000 times per second) delivering the correct voltage. The latest ones exceed 100kHz. Not a big deal for a heating coil, but kind of important for a PC or laptop.