HP iPAQ H1900 series Quick Start Manual page 37

Managing the Battery
4. Replace the cover by matching the tabs on the cover to the
latches on the iPAQ Pocket PC, and snap into place.
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CAUTION: The cover must be tightly latched in place for the iPAQ
Pocket PC to operate.
✎
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 about four hours to fully charge the battery.
3–4 User's Guide