HP h4000 - Manual (Page 32)

Managing the Battery
User’s Guide 3–7
3. Replace the cover by lining up the cover with the sides of the
iPAQ Pocket PC and sliding the cover up until it snaps into
place.
Ä CAUTION: The cover must be tightly latched in place for the iPAQ
Pocket PC to operate.
Note: If the battery is not fully charged, you must connect the
AC Adapter to the Pocket PC to fully charge it before continuing.
It takes up to four hours to fully charge the battery.