10000kms

I have bought a 2033 xxx second hand for $5100 Aus they are $5500 Aus new and the Speedo has just reset to nearly 10000 kms. I have lost contact with the seller but how long do these bikes normally last? It has approximately 170 charges and whenever the trip Speedo hits 1000kms it resets. The maximum battery capacity is 36.6ah and definitely doesn’t last as long as my friends brand new xxx. Should I be worried?