Use the cable that came with the device, or any decent USB-C cable. Plug it into a standard wall adapter—the kind that outputs 5V/1A is perfect. Fast chargers (the ones for phones) can push more current than the vaporizer's battery can handle, which might shorten its lifespan. If you only have a fast charger, check the manual for compatibility. When the light turns green (or whatever the indicator does), unplug it. Overnight charging is a no-no unless the device has auto shut-off, and even then it's better to avoid it.