18650 to 21700 adapter
thingiverse
A simple solution for running an 18650 battery in a mod designed for 2170x batteries is to use an adapter. Simply place a couple of coins at the bottom, then insert the battery (positive end first) into the adapter and attach it to your mod. **Use this converter at your own risk, as lithium-ion batteries are hazardous. I've been using mine consistently over the past week without problems, but results may differ for others.
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