Sense's new Orbit TF Pod System has an internal 1,100mah battery, and it can be charged via USB. It'll take just about an hour and a half to fully charge the battery. Although it has a larger built-in battery, it still keeps a compact form factor, making it perfect for on the go.
It is primarily constructed of zinc alloy and PC, so it's quite durable as well. The maximum e-juice capacity of the included pod is 3ml, and it does feature a top fill design.