I think the only thing in question is the co2 cost associated with the creation and consumption of the fuel, not the storage of the fuel or the parts that consume it.
But if https://climate.mit.edu/ask-mit/how-much-co2-emitted-manufac... is a good benchmark, we can probably assume the battery's manufacturing process releases between 3120kg and 15,680kg of co2, though that does describe a tesla model 3 battery and I don't know how similar it would be. For the sake of expedient math, I'll average them and say it emits 9,000kg of co2.
If we assume a lifespan of 200k miles, no part replacements, and no change in co2 costs/mile for EVs, then the total emissions would be:
~68,200kg for the EV (341g/mile) + the battery = 77,200kg total
~177,800kg for the non-EV (889g/mile), not including the manufacturing emissions associated with the ICE
Ultimately it's not an insignificant amount of co2, but in context it is actually pretty unimportant. It turns 341g/mile into 386g/mile. Of course, it's incorrect to assume an EV will have static "emissions" since they all come from the production of electricity, and given current trends it would be fair to assume those numbers will trend downwards. Gasoline, however, can probably be expected to have fairly static emissions over the life of the vehicle, likely actually getting worse as parts wear.
Most EV manufacturers are offering around 8 year/160,000-200,000km warranties on the batteries.
So not 200,000miles. But definitely covering the average usage pattern.
And not all will last that long, but the majority will. And potentially the worst case is just degradation - I.e. 200km range instead of 400km range, so still quite useful for a variety of use cases even outside of cars.
Yes, current EV batteries (not the old Nissan Leaf ones without active cooling) are projected to last as long as 3 million kilometres: https://youtu.be/7DYknTVskTw?t=325
Warranty is to some percent of original capacity, like 80 or 90%. Then you have another few hundred thousand miles for the next quantum of degradation.
But if https://climate.mit.edu/ask-mit/how-much-co2-emitted-manufac... is a good benchmark, we can probably assume the battery's manufacturing process releases between 3120kg and 15,680kg of co2, though that does describe a tesla model 3 battery and I don't know how similar it would be. For the sake of expedient math, I'll average them and say it emits 9,000kg of co2.
If we assume a lifespan of 200k miles, no part replacements, and no change in co2 costs/mile for EVs, then the total emissions would be:
~68,200kg for the EV (341g/mile) + the battery = 77,200kg total
~177,800kg for the non-EV (889g/mile), not including the manufacturing emissions associated with the ICE
Ultimately it's not an insignificant amount of co2, but in context it is actually pretty unimportant. It turns 341g/mile into 386g/mile. Of course, it's incorrect to assume an EV will have static "emissions" since they all come from the production of electricity, and given current trends it would be fair to assume those numbers will trend downwards. Gasoline, however, can probably be expected to have fairly static emissions over the life of the vehicle, likely actually getting worse as parts wear.