Ah, mine wasn’t the re-start type, just the basic battery with no extra bells & whistles. I needed some extra space under the seat, and this was a neat way to achieve that. The 801 type lithium battery is way smaller than the OE battery. But it has a decent CCA of 240. The Ah is lower than the OE lead acid type, but as I said, it’s done fine through a very harsh UK winter.
The new re-start versions look pretty smart, I’m sure they will be fine.