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So you’ve picked up a safer chemistry battery and know how to avoid the most likely scenarios where a battery could go boom. This isn’t the whole picture though, and the reason for this is that a given battery can only provide so much current. If you ask it for more than it can give, you’re running the very serious risk of suffering a battery failure.

As with many aspects of e-cig safety, all you need to stay safe is a little bit of information and an understanding of how it applies to vaping. Plus, in most cases – aside from when sub-ohm vaping is concerned – it is unlikely to be a problem.

Key Points

  • Ohm’s law says that current = voltage / resistance, and your battery can only provide so much current.
  • The maximum current allowable for a given battery is listed in amps as the maximum continuous discharge rating, or calculated from the “C rating” multiplied by the battery’s capacity.
  • If you’re looking for maximum amp draw, the Sony VCT4 offers up to 30 A.
  • For maximum safety, choose a larger battery and keep any coils you build over 0.8 Ω, unless you’re willing to do the math and understand the risk of battery failure (but lower resistances are rarely needed).
  • VV/VW devices have protection built in, so if you’re using a mechanical e-cig mod, the best advice is to fit a safety fuse and ensure you know the batteries limits. 

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