Have you ever noticed that your phone battery seems to live a perfectly healthy, energetic life—until the exact moment you desperately need it? Maybe you’ve been stuck in traffic ready to send a message, standing outside a locked gate trying to call someone inside, waiting for an OTP to complete a transaction, or using the maps app in a new city. The whole day your phone seemed fine. But now? The battery suddenly plummets to 1%, gasps dramatically like a Victorian-era character, and dies.