I believe they are more than that, but will depend on the make and model, and the vehicle’s battery capacity. I recall reading an article of the total costs for a $110k tesla, and they were quoting around 60% of new vehicle price. This did include labour costs which may also be high for some makes and models. It could be less for a cheaper make and model with a smaller battery capacity.
The reported battery life is difficult to be definitive about as it depends on a number of factors. How one drives the vehicle, how one charges the batteries, how often vehicle is used etc.
There seems be to some consensus that battery should last around 12 years or more. For some it could be 12 years, for others less or more. Others may chose not to change batteries.
While the 60% seems steep, one has to compare it with current cheaper energy costs and lower servicing requirements (inc consumables) when compared to a conventional ICE. The running costs are cheaper, but most costs benefit analysis doesn’t include battery replacement costs (when they happen). There seems to be information that it is still a 5+ years or more until they reach parity with conventional vehicles…and some of this parity includes disincentives for ICEs (higher taxes) and subsidies for EVs. Removing these pushes out parity timeframes.
Technically battery replacement isn’t necessary if one is happy with and can work within the ever diminishing range as the batteries age.
Battery replacement is an issue for low to middle income households as they are unlikely to be able to afford, without good budgeting’ replacing the battery in a second hand EV they buy within their budgets. It may mean these income groups are 'mileage disadvantaged in the future as they will be driving EVs with low battery capacities.
