Battery life variables

[CommaHolly]

again I say, some people are too smart for their own good

 

[Konstantine]

I'm not sure if i can understand you.

 

[Mroutlaw]

Do this calculations also include age of the battery?
Do they include the gradual voltage drop till the cut off? Cause when the battery discharges e.g. from 4.2V fully charged and gradually 4.1, 4.0, 3.9V up to 3.2 (which is the cut off) The calculations do change. Not to mention the ability of an aged battery to hold it's charge.
btw the 78mm battery is a 1.05Wh cell i wonder how the chinese got up to 340mAh's

It's not exact, but it's close. It is simple calculations based on ohms law.

I have actually tested the calculations by counting puffs, (I know, sometimes I have too much time in my hand) and was within 5 puffs of the calculation.

These calculations are the same ones that give the figures that you see advertised in companies site when the say things like "battery life is 200 puffs"

But again, it's just a way to estimate so that people get an idea of how long their battery will last when they get it

 

[CommaHolly]

I'm not sure if i can understand you.

figures

 

[Konstantine]

It's not exact, but it's close. It is simple calculations based on ohms law.

I have actually tested the calculations by counting puffs, (I know, sometimes I have too much time in my hand) and was within 5 puffs of the calculation.

These calculations are the same ones that give the figures that you see advertised in companies site when the say things like "battery life is 200 puffs"

But again, it's just a way to estimate so that people get an idea of how long their battery will last when they get it

Oh!
True, in that way it's correct, you can try and calculate.

If you want to get TRUE results it might be very difficult, i forgot the standby current concumed by the asic and during operation and the power losses from the mosfet.
The only accurate way might work is to dissasemble the battery, disconnect the power management and use a battery analyzer.
But the results won't differ much from the estimation..

figures

I really didn't understand it CommaHolly

 

[Mroutlaw]

Lol,

Hey I'm a landscape company owner who happens to like math equations, not a physicist or electrical engineer.

I'm just trying to help people get an estimate, don't hold me to an exact figure. Plus there are so many variables, the biggest one being how long your puff is. I venture to say no one does the same exact puff every time.

I myself have a had a battery last 40 minutes, and the same battery last 4 hours the next time. It all depends on how you vape.

 

[Konstantine]

Yeap, happens to me sometimes.
Sometimes it last half a day and sometimes 3-4 hours.

 

[CommaHolly]

LOL, I'm sorry, Konstantine! I didn't realize you were Greek and probably English isn't your first language

I was joking with you because you sounded so smart and technical!

 

[CommaHolly]

Your English is so good I didn't realize! I'm sorry!

 

[Konstantine]

LOL
You don't need to apologize, sometimes i can't catch expressions, that's all.

 

[awsum140]

There are so many variables, like standby current for the electronices (probably in the microamps), particualr style of use, amount of standby time (not being used), age of the battery, internal resistance of the battery, load from the LED (why is there an LED that lights with each inhale anyway that uses some current?) and so on, ad nauseum. One other "variable" is the fact that the atomizer places the battery under a load heavy enough to almost be a short circuit condition which also has an effect of battery life. Overall, MrOutlaw has a good approximation for battery life. I realy don't think there is a finite answer, each battery and user presents too many variations for an exact answer to be calculated.

 

[Konstantine]

The stand by current is 3μA , the led is around 3-10mA this depends on the color.
The battery discharges around 5C with a volt carto, the specs say MAX 10C