Part 5/12:

• Vibration Tests: Subjecting devices to shaking indicated that cheaper models with inferior internal components could have loose parts that rattle, stressing the internal cells and increasing risk of short circuits or internal damage over time.

• Drop Tests: Dropping devices from one meter onto a hard surface revealed that lower-quality power banks with weak casing could crack or open internally. Such damage exposes internal components, creating a recipe for thermal runaway or fire if the device is subsequently used or charged.

One particularly concerning finding was a power bank that bloated significantly after a short circuit test—an indication that it was unsafe to use and could potentially ignite in real-life scenarios.