The rumors claimed BYD’s solid-state batteries have an energy density of 400 Wh/kg, or nearly twice that of current lithium-ion batteries.

The report also stated that BYD’s solid-state EV batteries set a record by gaining a 1,500 km (932 miles) range in just 12 minutes of charging.

According to the report, the test charged the battery to only 80%, claiming the total EV range could reach upwards of 1,875 km (1,165 miles).

BYD did not confirm anything of this report, so take it as a rumor for now. Still this sounds pretty impressive to me.