Watch was fine until a couple of days ago when suddenly the battery monitor registered LOW. I left out in direct sunlight for an afternoon, and it registed a full charge. I left it for a couple more hours, then removed it from the direct sunlight, and it has dropped to MEDIUM charge and stayed there since. I have tried putting it back into sunlight, (cloudy day) and under an incandescent light and it still says a medium charge. It was always on the FULL mark before this. I've had it for about 16 months.
I own the a same CASIO PRG-240 watch.I think there is no problem.Charging every solar powered watch under direct sunlight has to be made in a well lighted and ventilated area, such as balcony and never behind a window glass.Charging from LOW to FULL is a long way (see instructions).Now showing FULL and when removed after a while, MEDIUM, is normal as the battery is not really fully charged.If you use an incandescent light,place the watch at least 50-60 cm distance from it.Usually there are no great results with the incandescent light.I never use this option.
Wear your watch for a couple of days (a week for example) under sunlight as much as possible and check.If it still shows MEDIUM after a time period, may be a battery replacement will solve the problem.
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