Battery Amp Draw / Drain Calculator

Battery Amp Draw / Drain Calculator

Welcome to Vaping Hardware’s Battery Amp Drain / Draw Calculator!

Battery safety is potentially the single most important aspect of vaping, regardless of the vaping device or setup you’re using. The good news is that VAPING IS SAFE as long as you understand battery safety

The Battery Amp Drain / Draw Calculator is for regulated mods only and helps you identify whether the batteries you’re using are capable of providing enough current to operate safely, especially if you plan on vaping at higher watts! For more information on calculating current drain, take a look here

Just input the maximum power your vaping device can operate at (Wattage), Battery Low Voltage Cut-Off, Current Rating of your battery (CDR), Mod Efficiency and the number of batteries in your device and hit the calculate button.

If the Current Drain/Draw from the batteries exceeds the CDR value of the batteries you intend to use, the calculator will warn you. Essentially, the results will show whether your set-up is safe to use!

We’ve also included a detailed FAQ at the bottom of this page!


Vaping Power (Maximum)   W
Current Rating of Battery (CDR)   A
Mod Efficiency   %
Battery Low Voltage Cutoff   V
No. of Batteries in Mod


Current Draw/Drain from Battery


Mod efficiency is the difference between what your battery is capable of delivering and what your device will actually output.

The efficiency of the chip set in many mods if typically around 85%.

For the specific efficiency of your mod, it’s worth taking a look at the manufacturer’s specifications.

This is the lowest voltage level that your mod will operate at before it shuts down to prevent the battery from over-discharging.

A typical cut off point value would be 3.2volts and discharging a battery beyond this level will limit the battery’s life.

If you continue to use a battery in this state it’s likely to become damaged and fail to hold charge.

CDR stands for Continuous Discharge Rating and is basically the rate at which amps can be drawn safely from a battery without it overheating.

The CDR value of your batteries can be found either on the battery or in the manufacturer’s specifications.

Potentially, yes you can. Just keep in mind you need to be aware of the maximum wattage your batteries can safely deliver.

Our calculator asks for the maximum wattage output of your device as a safeguard.

This is to make sure the batteries you use can safely deliver the power needed to vape at the maximum wattage available from your device.

If you only plan on using a fraction of your mod’s available power, you could potentially use batteries with a lower CDR rating.

No. As far as current draw/drain is concerned, it doesn’t matter how your batteries are configured.

Yes, the two are calculated slightly differently. In a regulated mod, the wattage remains constant throughout the battery cycle and maximum drain on the battery is reached when the battery hits the cut-off voltage (usually 3.2V).

In an unregulated mod, the wattage reduces as the battery discharges. Maximum wattage is calculated using a fully charged battery (4.2V).

While this calculator will help you work out what you need to know for a regulated mod, our Power, Resistance and Current Calculator is the equivalent for mechanical (unregulated) mods.

If we’re talking about regulated vaping mods, coil resistance doesn’t affect battery drain in any way whatsoever.

The battery amp drain is derived from the power (wattage) you vape at.

BUT… mechanical mods (unregulated devices) are a different ball game. Because the wattage is solely dependant on the resistance of your coil, it’s this value that determines the rate at which your battery will drain.

This message means your set-up is NOT safe.

You will need to use a battery with a higher CDR value. Alternatively, if you don’t plan on EVER using the maximum wattage your device can produce, you could reduce the Vaping Power input to the maximum you’ll vape at while using the battery you have.

We hope you enjoyed using our battery amp draw / drain calculator!

Please share this page and feel free to drop us a comment below!

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Comments 6

  1. why is nobody making table top mods that run off mains; and when shopping for Power supplies, prices are ridiculous once you get to the level of required amps; couldn’t you use a cheap power supply with a couple decent capacitors

    1. Post

      Hi PJ,
      Interesting question.
      While vaping on a mains powered device is something that I would not be very happy with, I am supprised that one of the major manufacturers have not come out with this as an optional device.
      3 things spring to my mind why I dont think it would be popular.
      Portability: limited to vaping while sitting next to a mains outlet. Just as easy to charge a set of batteries.
      Cost: When considering mains, the safety implications and approval would increase leading to higher prices. Considering how cheaply a lot of mods are produced, their quality approval process does leave a little to be desired. It would have to be a different ball game if its connected to the mains.
      Danger: Would you really want to put a mains powered mod to your face and mouth. There are very few mods/pods in the market right now that don’t leak. Having e-liquid seaping into the electronics while connected to the mains raises alarm bells for me.
      Certainly for me, charging a set of batteries while I’m at home is no problem and means I can take the mod/pod anywhere I want.

  2. I vape using temp control. All my TC capable mods have adjustable wattages, and I use the max for each.

    My question is: since the wattage used never even gets close to the max, what calculations can I use to determine if my batteries are safe to use?

    My batteries are Samsung 25R’s and 30Q’s.

    1. Post

      Hi Ross,
      Thanks for your question and it’s a good one. The wattage set when in TC mode is normally the maximum the mod will reach. When in TC mode, the wattage will vary to achieve the temperature setting you’ve chosen. Because you can adjust the temp to the max setting, you could be operating at a max wattage setting.
      When calculating battery amp drain, to ensure a safe margin of your battery you should use the maximum wattage the mod can operate at.
      You’re right in saying the drain of the battery will be less at a lower wattage but when operating in TC mode, the wattage the mod will fire at is a little unknown. It will use whatever is needed to maintain the temperature you’ve specified.
      To be safe, use the MAX wattage the mod can fire at.
      Hope this helps Ross.

  3. Hi, i want to build coil to be 1.0 ohm with 26 gauge nichtome 80 wire, how many round shouls i make? Diameter? At what wattage can i vape it ?

    Is it ok to vape 0.79 ohm coil with same material at 15watts? Cause when i put higher it fills like burning or is there something wrong with the build or else ?

    1. Post

      Hi Haji,

      Thanks for the comment. You might want to check out our ‘Coil Wrap Calculator’ as this’ll help you achieve what you’re after. To build a coil to your spec you would need 9 wraps with a 3mm inner diameter. If you’re using a mechanical mod this will vape at 17 Watts on a fully charged battery. If you’re using a regulated mod you can just adjust the wattage to find your sweet spot.

      Your 0.79 ohm coil should be able to easily handle higher wattages than 15. The burning your experiencing is probably being caused by your wick. This could be either the material you’ve chosen to wick with or the method you’re using to wick the coil. It sounds like your wick isn’t saturating properly which could also be caused by using a high VG ratio juice. If you’re after some more information on wicking your coils check out our full wicking guide.

      We hope this information helps. Any more problems feel free to give us a shout 🙂

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