Battery run time Ego 510. (Warning = LOOOONG post)

[gizmondothefirst]

Battery run time Ego 510. (Warning = LOOOONG post)

As some of you know I have been experiencing carto/atty issues, and the resultant reduced battery life. I was getting about 2 days use from each battery using the attys that came with the 510, but I was surprised to find that the carto's only gave approx. 4 hours use. I have since been searching the AAEC forum to find any info relevant to battery life expectancy, and came up with the following post, and more specifically reply # 53 from 'Dave' (Hope you don't mind me referring to this Dave?) I decided to use his formula/method to discover what kind of battery run times I should be getting?

www.allaboute-cigarettes.proboards.com/index.cgi?board=newmembers&action=display&thread=4797&page=3

To calculate total life of battery under use: (Quoting Dave from the earlier post)

Jan 14, 2012 0:37:03 GMT dave said:

Assume your battery is delivering 4 volts and your cartomiser is 3 ohms. When you activate it you are drawing 1.33 amps, or 1333 milliamps. So if you had a 100mAh battery that would give you 4.5 minutes of puffing. If you fire up the battery for 5 seconds each puff, that is 54 puffs. Now how many fags that is equivalent to is hard to say - at a guess at most 4 or 5.

I thought Dave was onto something here and I wanted to find out how he came up wth 4.5 minutes of puffing, so I could then calculate how long I should be getting from my battery. I may be wrong but I believe this is what Dave used:

(Battery rating (mah) x 60)
current drawn (mA)
(100 x 60)
1333
6000
1333 = 4.5mins
From this we can then calculate how many seconds the battery will operate for, and how many 'timed' draws we can get from it:
4.5 x 60 = 270 seconds
5 second draw =
270
5 = 54 draws.
I have seen it written on many occasions that the average cigarette is smoked in 10 draws, therefore making the above calculation equivalant to almost 5 and a half analogues.

So, onto the 510

This is based upon my Ego 510, which is rated at 1100mah. (Battery and carto/atty values have been measured by me using a multimeter)

510 battery = 3.76v (tested) rated at 1100mah (Not tested for obvious reasons-rated by manufacturer)
Voltage = Current x resistance (V = I x R)

Boge Carto = 3.4 Ohms. Current = 1.1amps (current drawn)
Std carto = 3 Ohms. Current = 1.25amps (current drawn)
Atty = 2.6 Ohms. Current = 1.44amps (current drawn)
DC carto = 2 Ohms. Current = 1.88amps (current drawn)


How long will the battery last with each of these cartos/atty?:

BOGE:
(Battery rating (mah) x 60)
current drawn (mA)
1100 x 60
1100
66000
1100 = 60mins

60 x 60 = 3600 seconds
5 second draw = 720 draws

STANDARD CARTO:
(Battery rating (mah) x 60)
current drawn (mA)
1100 x 60
1250
66000
1250 = 52.8mins

52.8 x 60 = 3168 seconds
5 second draw = 633 draws

ATTY:
(Battery rating (mah) x 60)
current drawn (mA)
1100 x 60
1440
66000
1440 = 45mins

45 x 60 = 2700 seconds
2 second draw = 1350 draws

DUAL CORE:
(Battery rating (mah) x 60)
current drawn (mA)
1100 x 60
1880
66000
1880 = 35.1mins

35.1 x 60 = 2106 seconds
5 second draw = 421 draws

This was a revelation! Out of all carto's/atty I find the atty and dual core carto's to give me the best vapes. I prefer the atty out of the 2, but it does my head in refilling so often Hence the move to carto's and the DC. It now makes perfect sense why I am only seeing 4 hours when using the DC in comparison to 2 days (ish) with the atty's.
I am now thinking I need a passthrough...stand-by for a new thread!

If these calculations are absolute rubbish please feel free to let me know otherwise I hope they can be of some help?!
(I apologise if the formatting is a little erratic - it wasn't easy!)

[blakey]

Jesus Giz, Just buy some more batteries

lol

That's not a bad attempt at explaining the battery life mate- nice one

[Jemima]

Yeah very handy comaprison for those of us who aren't so good with the electronics understanding bit, thanks

[Chrissie]

Lol, all I know is, the lower the ohm, the higher the drain

[dave]

Blimey giz you have been busy

I've played around with these sorts of calculations too and I agree they give some interesting results. It is all approximate of course, especially with most batteries where the voltage goes down over time, but with a regulated eGo a bit more accurate. I hope you have been timing a good sample of puffs and estimating the standard deviation, so you can work out 95% confidence intervals....I'm joking

A passthrough is one solution. The other I would suggest is get a RDA - you can put 10+ drops in those and equal or better most atties!

[maccafan]

You are right Giz..














It is long...

[gizmondothefirst]

I need to get out more!

To be fair I could have cut a long story short and just written about the conclusion I reached - which is:

I need another battery!

I only did those calcs for personal reasons - i needed to put something more exact to battery life than what i've read so far. What is 8 hours for one person, may be 2 hours for someone else who 'powervapes'.
I know it's not exact, and there are other variables which could affect the numbers, but it gives a ballpark of what I should expect. ANd it quelled any fears that I had that my batteries were duff.

And because I'm a sharing kinda guy I thought it may be helpful to share my findings, even if you have to ensure a bottle of juice is to hand so you don't run dry before you finish

[maccafan]

Multiply your final figures by 0.7 and it will be more accurate for batteries..

[gizmondothefirst]

Feb 5, 2012 20:35:57 GMT maccafan said:

Multiply your final figures by 0.7 and it will be more accurate for batteries..

is that for the multimeter correction......which I totally forgot about. Doh!

[maccafan]

Feb 5, 2012 20:37:40 GMT gizmondothefirst said:

is that for the multimeter correction......which I totally forgot about. Doh!

Not really...

As batteries discharge and load continues to be applied they discharge even quicker. They also self discharge without being used. Also as they age, they lose their capacity over recharge cycles. So a power factor of 0.7 is applied as a constant to the theoretical battery rating. So if someone says 1000 mah that means you start the calculation at 700 mah.

If you want to be really accurate you need to know a battery's Peukert Number amongst other things like temperature and humidity etc.,

You cannot directly apply Ohms law to calculate battery life.

[Chrissie]

Giz, I hope you don't mind, but I'm going to move this to the general section. It's a brilliant thread, but may be a tad confusing for the many guests (averaging 700 a day now) that visit the forum & especially the new members section

[gizmondothefirst]

Feb 5, 2012 21:01:21 GMT maccafan said:

Feb 5, 2012 20:37:40 GMT gizmondothefirst said:

is that for the multimeter correction......which I totally forgot about. Doh!

Not really...

As batteries discharge and load continues to be applied they discharge even quicker. They also self discharge without being used. Also as they age, they lose their capacity over recharge cycles. So a power factor of 0.7 is applied as a constant to the theoretical battery rating. So if someone says 1000 mah that means you start the calculation at 700 mah.

If you want to be really accurate you need to know a battery's Peukert Number amongst other things like temperature and humidity etc.,

You cannot directly apply Ohms law to calculate battery life.

EEEk!
There's a little more to this than meets the eye!
So basically I churned out nothing more than a collection of numbers and an equal amount of waffle?
It worked for me, albeit temporarily, but it does add a lttle theory behind why different resistances can affect battery run time, and by how much.

[gizmondothefirst]

Feb 5, 2012 21:22:42 GMT Chrissie said:

Giz, I hope you don't mind, but I'm going to move this to the general section. It's a brilliant thread, but may be a tad confusing for the many guests (averaging 700 a day now) that visit the forum & especially the new members section

Thats ab fine Chrissie,

I only placed it in the newb section so people could gain an understanding of how long a battery may last relative to their useage. Something I would have been interested to learn pre-ecig investment.
Probs v confuddling though, so no worries

[maccafan]

Your calcs are spot on theoretically..Just multiply them by 0.7 and you won't be far off what you get in real life.. It's nice to be able to work things out..

I put this spreadsheet a few days back for Perpetua and it may be of help to you..

[gizmondothefirst]

Now that I like!!!
Will it be made available for all to see? (I realise it is now but I mean sticky'd)

An invaluable source of info!

Thanks Maccafan!