Most buyers fixate on size and puff count. They think a smaller device is easier to handle, and a higher puff count means longer use. In reality, for home use, size is a minor factor—you're not pocketing it all day. And puff count is estimated under lab conditions that don't match how you actually vape. Your draw length, the thickness of your oil, and how often you hit the button all change the real number.

Battery capacity (mAh) is the spec that directly translates to how often you'll be reaching for the charger. A 500mAh battery might last a full day of moderate use; a 280mAh one will have you plugging in by evening. That's a spec worth checking.