Well, a wrong incentive.<p>A battery being charged can get to 60° without any help, usually it is a problem.<p>Any battery above around 20kWh will need very good cooling for any much high charging speed.<p>Battery volumes scale nonlinearly with their cooling needs, obviously. And big batteries require heavy cooling systems.<p>Under 20kWh packs may not need a cooling system as such, which is a big, big cost, weight, and complexity saver.<p>This way, a faster recharging, but smaller, and more durable battery might be way more practical in kms driven vs. hours spent charging.<p>Telsa gets 5 km per kWh, and takes an eternity to charge, Renault Twizy gets almost 10 km per kWh, and charges at 12 km per minute with aftermarket fast charger.