The HoneyStick BeeKeeper is almost a great device. It’s a 510 battery for use with both refillable and pre-filled cartridges, is highly portable, and has a magnetic adapter to make inserting the cartridges even easier. So what went wrong? For starters, it only has a single voltage setting, plus it can’t use thicker oils and larger cartridges. So, it has all the right ideas but it just falls a little short in the execution of each of them. There is supposed to be an upgraded version coming soon but for now, it can’t compete with other, better batteries.