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Switch not completely opening the curcuit?

rj9923

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So I recently used the enclosure from a broken IPV4 to build my first mech mod. I rewired it to take a single 18650 and replaced the chip with just a toggle switch. It's been working great, but today I attached my multimeter to the 510 connection to read the battery voltage. Just out of curiosity, I turned off the switch and kept the leads on. With the switch "off", my multimeter read 0.32 volts.
Is there something wrong with my switch?
 

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