Yes that was a hangup for me, but keeps the price down.
In fact for older cars it in effect acts as an extended warranty on the batteries as they swap out if performance drops below 75%.
And as an added bonus you get free roadside assistance included so I can drop our AA cover that saves another £150 (3 months of the battery lease).
Sounds good. It is a really good car. Will save loads in fuel.
If you can, get a granny cable and keep it in the boot for emergencies.