One of the nice things about the Toqi is the multiple voltage settings. While some people prefer draw-activated magnetic adapters, I tend to lose them and always opt for a threaded design. While the 400mAh isn't best-in-class for battery life, it's more than enough to get the job done. Compared to some thinner designs, the metal tips of the battery are surprisingly durable as I dropped the Toqi four feet onto the pavement with nothing but a small scratch to show for it. Pen-style batteries like the Tronian Pitron are going to be way easier to fit into your pocket, though.