yes it will last longer. The watts will also be lower too though. If you're
vaping on it & find you have to take a really long drag to feel like you're getting a good hit you might want to keep it at the higher volt. In the end, if you're holding the button down longer then you're still using about as much of the battery as you would be at the higher voltage with a shorter hit. You'll just have to test it out & see what you think.