Dell S500 User Manual page 48

NOTE:
lit all the time until the charging completed.
NOTE:
fully charged battery will allow up to 25 hours of non-stop use or up to 4 weeks
in standby.
CAUTION:
48 Using Your Projector
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During the charging process, Interactive Pen amber battery light will be
For first time use, it takes at least 4-5 hours to fully charge the battery. A
If your docking charger cannot charge, contact DELL™.