My second (portable) computer is an HP 4540s, 3-4 years old.
Just turned it on, after 60 days non-use, with wall charger (WC) just plugged in, and it boots up normally. However, when placing the cursor on the small battery symbol in the lower right corner I get the message - 10% available (plugged in, not charging). Without the WC plugged in, it makes no effort to START. Running with the WC plugged in, if I unplug it the unit goes dead.
Is this likely the simple matter of needs a new battery, or could there be some software function I need to access and adjust?