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]
The difference between solar and battery operated G-Shocks: both are powered by batteries, but the solar ones use rechargeable batteries and include small solar panels that recharge the battery, so if you use the light and/or alarms frequently, you probably won't have to change the batteries as often in the solar versions. . [pdf]
This lithium battery is rechargeable with solar power and it is a high quality replacement battery with a very long life. Some popular Casio® models that use the CTL1616 are the Pathfinder, Waveceptor, Atomic and of course the widely popular G-shock line. [pdf]
The basic purpose of 4 volt solar battery is to effectively provide and store energy. These batteries are appropriate for preserving steady power output in applications requiring a dependable voltage supply, given their stable voltage output and large surge currents. [pdf]
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