noun
running out of battery; dead battery
Used especially for electric vehicles (EVs) when the battery runs out of charge, analogous to ガス欠 (running out of gas). Also used for other battery-powered devices.
高速道路で電欠してしまい、レッカー車を呼んだ。
I ran out of battery on the highway and called a tow truck.
スマホが電欠しそうだから、モバイルバッテリーを貸して。
My smartphone is about to die, so lend me a power bank.
A modern compound of 電 (electricity) and 欠 (lack), modeled after ガス欠 (running out of gas). The exact origin is uncertain, but it likely emerged with the spread of electric vehicles.