Average running time of the battery

[pdicox]

I’m lucky that I can wear mine at work so I use it 5 days/ 8 hrs. It is approx 2 yrs old. Have been having to re charge after 2 hrs lately .No album art, min everything.  I noticed last night after charging  for 5 hrs at home, screen battery indicator was showing full but under system settings, info power was at 77%.  I would appreciate any and all help.