Didn't know you could do that.
Do you know for sure about claiming a battery in Care Refresh ?
Obviously it became noticeably faulty after the 6 month warranty.
I think 6 months warranty on what is obviously a high grade Lipo is a bit short, would expect such a thing to be good for at least 12 months to 24 months.
Yours has lasted close to 18 months after purchase, so I suppose that is close to reasonable to some people, if it's been cared for right and had a fair amount of use.
Here in Australia, many household appliances purchased have 12 mths warranty.
Consumer law here states that an items should be warranted as long as one should reasonably expect it to last, based on cost of an appliance, and the general lifespan of an item.
Eg, a TV or washing machine it's not unreasonable to expect 2 to 5 years, but many would say if it cost over $1000 it should be 5 - 10 years.