It says out of 300k, about 100k on E-charge. 100k / ~40 comes to 2500 full charge cycle.
There is one user posted it something relevant regarding what I was looking for :
If PhD guy predicts the 500 discharge cycles (which obviously underrated) it will last probably less than 2 years.
- JPP • 5 months ago Need to share this with Richard Muller, PhD from Stanford who predicted that the Volt would need a complete battery change after 500 charge/discharge cycles. Looks like this Volt got over 2500 and the battery is still holding the rated charge