Please choose the correct ending to complete the given sentence: Computers and Electronics: [header] How to put out a cell phone fire [title] Know how to recognize a cell phone fire. [step] Most cell phone fires are caused by what's known as " thermal runaway " in the lithium-ion battery cell. When this happens, the first thing you're likely to notice is dense, black smoke accompanied by a distinct burning odor.

Ending1: When smoke on the device heats up, it has basically become a fire in the cell phone's battery, and the charger will jolt, unlike when the battery simply stops working. [title] Determine if your battery was reduced or suspended. Ending2: [substeps] It may take several days or weeks for a smoke signature to become apparent. An infrared or thermal sparking solution is suspected to be a source of energy. Ending3: For a cell phone fire, however, this dissolves quickly and does not immediately manifest as an emergency. Keep an eye out for any smoke marks visible on the ground. Ending4: The battery itself will then ignite, often emitting small white flames or a faint reddish glow. [substeps] You may also hear a loud popping or sizzling sound as the chemical-infused metals in the battery continue to burn.

Answer format: ending1/ending2/ending3/ending4