I get the bar to say "running on reserve power" but when I plug in the charger it has 40% or more showing.  Any ideas?

This problem has developed all of a sudden.  I unplugged the computer from the charger and within minutes I got the message "Running on Reserve Power."  When I plugged it in the battery percentage read 80%.  After  few minutes the green light on the charger was lit.  The next day whne I got the same message I plugged it in and it showed 44%.  Is this a battery issue?  Or something else?

How old is your battery?
How many charge cycles does it have?
And, FYI, your question concerns your laptop, but you asked your question in the iMac forum.

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