Hi! I have a Lenovo Thinkpad W530 and the battery wear level is at 98% and the laptop even turns off if the charger isn't plugged but the battery shows no sign of physical damage nor does it seem to be swollen, it literally looks like new
Lithium Ion batteries will "wear out" after several hundred charge cycles. They do not look any different on the outside when this happens. Time for a new battery I suspect. I have seen a lot of crappy non-OEM replacement batteries. Buy it from Lenovo if you can. Amazon is a crap shoot when it comes to batteries.