using cell phone adapter for passthrough?

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markfm

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Amp output ratings may matter. amps = volts/resistance. If your power supply is 5 V output, and you have a 2.5 ohm atomizer, you would want 5/2.5 = 2A (2000 mA) rating on the power supply output.

(and a 3 ohm atomizer needs a power supply delivering 5/3 = 1.7 A current, if it's 5V output)

(That's why you see people recommending a 2A output for the cigarette-lighter-to-USB adapters for cars)

Be careful if you look for an AC-USB supply online. Some of the multi-port USB ones state 2A, but it's actually 500 mA per port maximum.
 
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