The article says the battery is split, with an LFP traction battery and another undefined battery to make up the "range extender" - presumably the bulk of the c

The article says the battery is split, with an LFP traction battery and another undefined battery to make up the "range extender" - presumably the bulk of the capacity. So I suspect they've got some sort of novel high capacity low discharge battery which keeps the regular LFP battery topped up, which then drives the car.