They play hard ball with warranty
My 4-year-old battery failed after about 4,800 km, probably only 100 charging cycles. It should be expected to last longer than that. I politely quoted my rights under Australian Consumer Law. They wanted to charge me $150 for assessment, non-refundable, nor discountable off a new battery.
They do not offer a battery repackaging service.
The editor of RENEW magazine said:
"That battery does look like a pretty high grade unit, I suspect that at nearly 5,000 km. it has only seen 100 cycles or so, which is very low. I know it's out of warranty, but consumer law states that an appliance etc has to have a reasonable expected life span. so it would be worth talking to the manufacturer. Failing that, the replacement pack might be your best option."