Very valid points. Keep in mind a charge cycle is 0-100%, if you charge to 50-100 and then again 50-100 then you’ve got your 1 cycle in 2 charging sessions. No two batteries will perform the same, even from the same manufacturer, it’s a chemical process which takes place in its lifetime, and while averages exist, it’s hard to forecast exactly. About the warranties, on the EVs side, the 8 years I believe is very conservative. In fact legislation in the US is already in the works to push EV battery warranties to 15 years. I believe they have kept it a 8 years more from an accounting perspective, for the brands to have closure on the cars lifetime value to them, once warranty responsibility expires. I think 8 year warranty on the PHEV battery is a further stamp of approval on the battery longevity, which as you are saying will reach the charge cycles far quicker

Small island hehe