HP Apple iPod from HP MP7001 30GB Color Music Player - Manual (Page 52)

52 Using iPod
Battery States
When iPod is not connected to a power source, a battery icon in the top-right
corner of the iPod screen shows about how much charge is left.
If iPod is connected to a power source, the battery icon changes to show that the
battery is charging or fully charged.
You can disconnect and use iPod before it is fully charged.
Note: Rechargeable batteries have a limited number of charge cycles and may
eventually need to be replaced. Battery life and number of charge cycles vary by
use and settings. For more information, go to
http://www.hp.com/go/music/battery
Battery less than 20% (red)
Battery about halfway charged
Battery charging
Battery fully charged