Costco KS continuing support?

What is the battery life of the KS10? Mine are 17 months old. I gather many rechargeable HA start to die at 3 years. If so, I guess I should make a warranty claim at month 34 if I notice a change.

With my KS8s my Costco recommended sending my aids into the manufacturer for servicing & updating before the warranty expired. Costco loaned me aids while mine were being serviced.