The battery is fine. After hitting about 400-450 full cycles, your max charge drops to 80% of the designed capacity, which is still great and shouldn't really affect your routine as much as you would think on paper. But again, batteries eventually die out and such, that much is inevitable, but your battery should probably last another year and a half or two at the very least because the capacity becomes unbearably low.
My first 4, I had the battery replaced after about 600 cycles or so when the bit of battery life difference at that point was basically the difference between having to worry about my charge mid day and not since I went ham on my phone back then.