Like most of the reviewers here I call a lot and without a second battery it is not. Therefore I find the solution to the charging compartment for spare battery just perfect. The battery Battery for HTC Desire Z 3,7VDC / 1300 mAh I ordered along with the docking station. The two products complement each other wonderfully. So I always have charged my HTC and extra battery. Synchronization via this docking station running without losing data. Overall, highly recommended for frequent callers who seek not only compensation for power supply but need the spare battery Desire Z.
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