Let's talk about battery life on high wattage mods

[novamatt]

So I'm about to move into the high wattage world, and it's come down to a choice between 2 options.

1) The new YiHi SX mini mod / ZNA30 / ZNA clone,

or

2) Build my own SX350 mod for 60 watts with 2 18650s.

The big reason I'm not sure yet is battery life. How much time are people getting off of a single 18650 on these high wattage mods? I really like the form factor of the ZNA style mods, but I don't want to be carrying a bunch of spare batteries with me everywhere. If you've got a single battery mod, do you wish you had a dual? If you've got dual, is it overkill?

Thanks!

 

[dragonsdeath]

Not much help, but. I just got my first high watt mod. an IPV3. Right now I've got a 0.32Ohm build on it and vaping at 44.9w my new batteries will last all day. They are 2500mah batteries.

 

[rusirius]

So I'm about to move into the high wattage world, and it's come down to a choice between 2 options.

1) The new YiHi SX mini mod / ZNA30 / ZNA clone,

or

2) Build my own SX350 mod for 60 watts with 2 18650s.

The big reason I'm not sure yet is battery life. How much time are people getting off of a single 18650 on these high wattage mods? I really like the form factor of the ZNA style mods, but I don't want to be carrying a bunch of spare batteries with me everywhere. If you've got a single battery mod, do you wish you had a dual? If you've got dual, is it overkill?

Thanks!

It's fairly easy to calculate actually.... It's just that batteries are rated in amp hours rather than watt hours and in our particular application it's easier to think of watt hours... Fortunately that's easy to calculate.

MAh * V / 1000 = Wh so let's say we had a VTC5 rated at 2600mAh...

2600 * 3.7 / 1000 = 9.62 Wh... Simply stated, that means you can run it continuously at 9.62 watts for 1 hour... If we multiply by 60 we get 577.2 watt minutes...

If we wanted to run at say 30 watts, we can divide it out... 577.2 / 30 = 19.24 minutes at 60 watts we'd have 9.62 minutes...

So if your average draw is say 5 seconds we'd have 115 puffs at 60 watts... 231 puffs at 30 watts... etc.... (multiply watt minutes * 60 to get watt seconds then divide it out)

If you slap another battery in it then you're doubling it... 230 puffs at 60 watts.. 462 puffs at 30 watts, etc....

You also have to consider regulator efficiency... All regulators have a loss... So if the regulator is only 90% efficient then you're only going to get 90% of your calculated figures.... etc.... Also don't forget to consider normal drain. Adding a screen is going to add some drain and obviously eat into some of your runtime... The MCU is going to draw some power when not firing as well, etc... But those loses will be minimal compared to actually firing the device.

 

[inswva]

It's fairly easy to calculate actually.... It's just that batteries are rated in amp hours rather than watt hours and in our particular application it's easier to think of watt hours... Fortunately that's easy to calculate.

MAh * V / 1000 = Wh so let's say we had a VTC5 rated at 2600mAh...

2600 * 3.7 / 1000 = 9.62 Wh... Simply stated, that means you can run it continuously at 9.62 watts for 1 hour... If we multiply by 60 we get 577.2 watt minutes...

If we wanted to run at say 30 watts, we can divide it out... 577.2 / 30 = 19.24 minutes at 60 watts we'd have 9.62 minutes...

So if your average draw is say 5 seconds we'd have 115 puffs at 60 watts... 231 puffs at 30 watts... etc.... (multiply watt minutes * 60 to get watt seconds then divide it out)

If you slap another battery in it then you're doubling it... 230 puffs at 60 watts.. 462 puffs at 30 watts, etc....

You also have to consider regulator efficiency... All regulators have a loss... So if the regulator is only 90% efficient then you're only going to get 90% of your calculated figures.... etc.... Also don't forget to consider normal drain. Adding a screen is going to add some drain and obviously eat into some of your runtime... The MCU is going to draw some power when not firing as well, etc... But those loses will be minimal compared to actually firing the device.

And for those of us too lazy to deal with math:

Battery drain | Steam Engine | free vaping calculators

 

[rusirius]

Not much help, but. I just got my first high watt mod. an IPV3. Right now I've got a 0.32Ohm build on it and vaping at 44.9w my new batteries will last all day. They are 2500mah batteries.

So just for fun as a demonstration....

5000 * 3.7 / 1000 = 18.5Wh / 1110Wm / 66600Ws

So at 44.9w that's 1483 seconds... At say a 4 second draw that's 370 puffs (again that's high depending on efficiency...)

 

[edyle]

So I'm about to move into the high wattage world, and it's come down to a choice between 2 options.

1) The new YiHi SX mini mod / ZNA30 / ZNA clone,

or

2) Build my own SX350 mod for 60 watts with 2 18650s.

The big reason I'm not sure yet is battery life. How much time are people getting off of a single 18650 on these high wattage mods? I really like the form factor of the ZNA style mods, but I don't want to be carrying a bunch of spare batteries with me everywhere. If you've got a single battery mod, do you wish you had a dual? If you've got dual, is it overkill?

Thanks!

If you vape at 60 watts, you will be using 4 times more power than somebody vaping at 15 watts (last years mods, like vamo5, zmax, svd);
You will run down your battery 4 times faster.
That means, if you used to use 1 battery per day, now you might use 4 batteries per day.

Having 2 batteries also means less stress on each battery than having just 1 battery trying to supply all the power

 

[rusirius]

And for those of us too lazy to deal with math:

Battery drain | Steam Engine | free vaping calculators

What have you got against math???