Voltage Drop Question

[Cool_Breeze]

Does the capacity (mAh) of various batteries have any effect on the voltage drop when it is loaded? Or, put another way, does a larger capacity battery exhibit less of a voltage drop under load?

If the capacity is not a major factor in voltage drop, what factors are?

 

[RedAlert]

Battery chemistry has more to do with it than the mah. For example, take IMR batteries.In the 18650 size, you can have the regular Lion coming in at 2600 mah, and the IMR at 1600 mah. Quite a spread, yet under load voltages the IMR wil usally yield .2v+ over the lion. To some (like myself) that .2 v isnt worth the difference in vape time for the two batteries. I can kill the IMR in 8 hours, the 2600 takes me almost 14 hours.

Now if your comparing the same chemistry batteries, just different sizes, yes the larger cell will generally beat out the smaller one, like comparing a 14500 to an 18650.

 

[Cool_Breeze]

More specifically... Will a Lion 18650, 3600 mAh and a Lion 18650, 2400 mAh show essentially the same voltage drop when each is used on the same load?

 

[RedAlert]

Probably very close to the same if the cells are the same quality. In my expeience, most battery manufacturers (aside from AW and panasonic) really over exagerate their mah ratings.

 

[Cool_Breeze]

Thank you!

 

[Cool_Breeze]

In terms of Amps, Volts and Watts, or as appropriate, what does 'high drain' mean?

 

[RedAlert]

High Drain in a non scientific way means that when the current that is being used by the circuit (the atty in our world) is higher in the amp range (usually over 2 amps is where they start benefiting us, so if you're using a 1.5 ohm atty, it does help), it is not stressing the battery at all since they have a chemistry that enables them to output more amperage than a standard Lion cell

 

[Cool_Breeze]

Thank you!

 

[WillyB]

Does the capacity (mAh) of various batteries have any effect on the voltage drop when it is loaded? Or, put another way, does a larger capacity battery exhibit less of a voltage drop under load?

If the capacity is not a major factor in voltage drop, what factors are?

I don't know what exactly uou mean by 'voltage drop'. To me that infers the overhead a regulator needs to provide a set voltage. To maintain 5V out you will need about 1-2V more going in, depending on the reg.

With your regulated mod get one of those gizmos and set your loaded volts.

As far as vapetimes it's about the true mAh of the cells, IMR/High drains are not needed with a stacked pair/regulator. With smaller cells the mAh is similar, but once you move to 18650s decent Li-Ions will always out last IMRs with a switching reg.

Look at this older test at a 2A drain. In a single cell mod that would be about a 1.9Ω atty/carto.

Sure the AW IMR (green trace) starts out a little higher, but compare it to the AW2600 Li-Ion (black trace).

All decent 18650 Li-Ions can supply 3+A without breaking a sweat.

 

[Retriever]

Just curious - How does a Provari give you 5 or 6 volts when it only has 1 18650 in it? I'm confused.

 

[riin]

Just curious - How does a Provari give you 5 or 6 volts when it only has 1 18650 in it? I'm confused.

Was wondering the same thing myself

 

[Cool_Breeze]

...electronics...variable voltage...boost circuitry