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.