I am using a car charger (don\'t know where it came from, was just laying around the spare parts drawer when I went looking for one). The print on it states 4.5v@1A. It specs out at 4.85v under load. I also made one using a Maxim regulator chip that outputs 5v@2A. Maxim supplies samples of their chips to developers. I requested a sample and they sent me 2 . I haven\'t built another charger yet, but since my desk is wired for 12v (ham radio stuff) I fully intend to. Also, the ipaq chargers work with the Z. I have a HP2215. The Z charger stays at home (longer cord) and the ipaq at work. So any car charger for an ipaq (make sure of the plug design though-should be the round Z type with an included adapter for the ipaq stuff) should work great for a Z.