Donut Lab, a Finnish startup, claims it’s cracked the code on solid-state batteries—promising ultra-fast charging, high energy density, and no rare earths. But with no patents, public data, or independent tests, experts are skeptical. Is this a genuine leap ahead of industry giants, or just another overhyped tech promise? Would you trust your next EV to a battery shrouded in secrecy? Let’s debate. #Tech #SolidStateBattery #EVTech