When a starter rapid cycles like that, it's starved for amperage. The solenoid closes, the power is insufficient, so the solenoid drops out, as soon as it opens the connection, the voltage jumps back up, the solenoid closes, the cycle repeats.
You'll need an analog volt meter or a test light.
Start with your volt meter or light directly on the battery posts (not the cable ends). Take the voltage reading while trying the starter. If the power drops to near zero, the battery is bad. If the voltage is good, start methodically moving one test lead at a time, testing under load, until you track down where the drop is.
As you saw happen in the video, it can start cranking at any time, be careful!
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