Should the battery go low or go dead, expose the face (solar panel) to light as soon as possible. Exposing the watch face to light after the battery goes dead will cause the second hand to revolve counterclockwise until it stops at second 57. This indicates charging has started. [pdf]
[FAQS about Casio tough solar dead battery]
Should the battery go low or go dead, expose the face (solar panel) to light as soon as possible. Exposing the watch to light while its battery is dead will cause [CHG] to start flashing. Expose the watch to light to charge it until the Timekeeping Mode screen re-appears. [pdf]
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