Porsche has unveiled an upgraded version of its Taycan electric model. One of the biggest changes to the Taycan is the inclusion of a larger battery – now 12kWh bigger than before at 105kWh – which unlocks a top range of 680 km on rear-drive, single-motor Taycan models equipped with the optional Performance Battery Plus. It represents a big jump on the 505 km that you would’ve got from the equivalent model in the older range of Taycans. Porsche has also managed to increase the charging speed of the new Taycan, too, with it now standing at 320kW, which is 50kW than before. The tweak makes it th…