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.

References 1 2 3 4 Category JuiceBox