The article says their battery keeps 91% of initial capacity after 1,700 cycles at a rate of 2C, or 74% after 1,000 cycles at 5C, which sounds pretty reasonable

The article says their battery keeps 91% of initial capacity after 1,700 cycles at a rate of 2C, or 74% after 1,000 cycles at 5C, which sounds pretty reasonable given charge/discharge rates would likely be a lot lower than that in practice.