They will be contracted to purchase a certain number of the old batteries. If they havent reached that figure it doesnt make financial sense to invoke a penalty clause and change early. In that situation the obvious thing to do would be to change one product variant over to the new cells first and use the old ones up on another variant. It's quite possible that's what we're seeing here, and when they are able to they will swap the RHD UK variant over to the new cells too. It may have already happened, it may not. The extra ~20 miles would be useful but isn't a dealbreaker for me as my commute is an 18 mile round trip haha.