If the battery have started to swollen, get rid of that thing. It's just a matter of time before that thing will explode on you.
What does it mean battery wear level??98.5%
The wear level is how much battery charge you've shaved off the lithium-ion battery. The 98.5% tells you that you only have 1.5% of your designed capacity available to be charged. The rest of the battery cells have died and aren't working.