Casios are usually solid watches; I've been a fan all my life and have 6 currently and will keep buying them as long as the brand is around. But this one's solar cell didn't keep a charge longer than a day or so without exposure to light. It very well could have been a defective watch; chances are I had the only one with a bad solar cell. But there it is. I have two other solar-powered Casios that can go weeks, months without exposure to light without draining the battery.