I just got an early 2015 13inch retina macbook pro, with 511 battery count, at about 85 percent design capacity, is it ok, can I get a bit more out of it or does it need a new battery soon?
Typically, you should be able to get at least 1000 cycles on a battery. As long as the battery is holding a consistent charge and isn't showing signs of physical problems, (e.g. swelling inside the compartment) I would not worthy about it.