mAh to actual battery life

[TheLawbird]

So I don't know if this has been discussed, but I though I'd lay it out just incase since I couldnt find it anywhere. Anytime someone discusses a mod with a mAh rating, someone has to ask how long that battery will last. The answer is typically "it depends" but there is a pretty simple calculation to turn mAh into something practical, as long as you have a general idea of what your vaping habits are, and especially if you are very consistant with your vv/vw and what resistance coils you like.

It is: (mAh/amp draw in mA) .7

To find your amp draw, just Google ohms law calculator, plug in your known values

Example: I use a 1.8 ohm coil at 20 watts, that calculator shows it to draw 3.3 amps, which is 3300 milliamps

I do this on a 5000mAh ipower

So (5000/3300) x .7 = 1

If I were able to press and hold the button with that coil at 20 watts, the battery would last one hour or 3600 seconds.
I generally take about 3 second draws so I can get about 1200 puffs on a full charge
At roughly 40 puffs an hour (my best guess) the battery should last me 30 hours.
I vape probably 10 hours a day so I should be good for 3 days.
That is actually pretty consistent with my real world experience so far. I have gotten 3 days on one charge.

So there it is; like it, lump it, discuss it, or delete it if it's in the wrong section or already previously discussed.

 

[93gc40]

There's also an ap for that... I use steam-engine mostly.

Sent from my SCH-I605 using Tapatalk

 

[Kerrigor]

So I don't know if this has been discussed, but I though I'd lay it out just incase since I couldnt find it anywhere. Anytime someone discusses a mod with a mAh rating, someone has to ask how long that battery will last. The answer is typically "it depends" but there is a pretty simple calculation to turn mAh into something practical, as long as you have a general idea of what your vaping habits are, and especially if you are very consistant with your vv/vw and what resistance coils you like.

It is: (mAh/amp draw in mA) .7

To find your amp draw, just Google ohms law calculator, plug in your known values

Example: I use a 1.8 ohm coil at 20 watts, that calculator shows it to draw 3.3 amps, which is 3300 milliamps

I do this on a 5000mAh ipower

So (5000/3300) x .7 = 1

If I were able to press and hold the button with that coil at 20 watts, the battery would last one hour or 3600 seconds.
I generally take about 3 second draws so I can get about 1200 puffs on a full charge
At roughly 40 puffs an hour (my best guess) the battery should last me 30 hours.
I vape probably 10 hours a day so I should be good for 3 days.
That is actually pretty consistent with my real world experience so far. I have gotten 3 days on one charge.

So there it is; like it, lump it, discuss it, or delete it if it's in the wrong section or already previously discussed.

Thanks alot. I was wondering how you calculate it. I have an app for it but I like to know te math behind it. Great post

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[KenD]

You never get to use all of the mAh of a battery though, not to mention that you'll get less out of a battery the harder you push it. It would be great if it would be that easy to calculate real world vaping time but it simply isn't.

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[TheLawbird]

True. But as a general guideline it's at least been accurate for me
Mutiplying by .7 is supposed to accomodate for other factors that may affect battery life, but if you want to err on the side of caution you could always change that value to .6 or even .5, as well as only put in a percentage of your actual mAh rating.
So maybe for a real heavy vapor I would use ((mAh x .9)/amp draw).6