JuiceBox DCPower Plug
from the BBS:
The "official" (H4446) JB AC adapter connector measures:
*4.8mm OD *~1.7mm ID *8mm long *center positive *4.5VDC
Other adapters that have been known to work:
*Many Pocket PC power supplies (5V 3A) *PSP power supplies (5V) including USB (500mA) *Some home router power supplies
NB: it is preferable to have a "switched" unit when using >4.5V adapter, to prevent damaging the JB.