Hi
I had the same problem myself recently, but my unit is only six months old. I solved it by running it down to 1 bar remaining, doing a complete shutdown of the unit and then charging until the red light went out.
I figured it was similar to calibrating the battery monitor on a laptop so just did what I normally do for that. Seems to be fine now, holding the full battery indication for the normal period of time.
Hope this helps
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