First of all, which Xstar charger are you inquiring about? There is no XP2 model that I'm aware of.
There is an SP-2, WP-2, and a MP-2.
Battery chargers at RTD Vapor
I personally have the Pila, the Xtar MP2, and the Nitecore Intellicharger i2. The Pila is hands down the better charger, but it should be for the price. It charges similar
batteries faster and looks like it is built to last years. No regrets paying the extra bucks for it.
The other two are not as sturdily made construction wise. Not really a fan of the metal slider in the battery compartment of the Nitecore; it's stiff and difficult to place
batteries in it. The Xtar MP2 has flimsy springs in its battery compartment which also makes inserting
batteries in it difficult without bending the spring to the side. I much prefer the spacers used in the Pila; easy in and out. The two seem to charge similar size batteries at the same speed, so no preference concerning that aspect. Both of these chargers use an USB cord that plugs into a USB/wall unit plug (included).