Comment Solar powered calculator (Score 1) 262
Years ago Casio came out with a dual powered system and I was mighty pleased with it because it had a solar cell. Years later the calculator stopped working; no amount of light on the solar cell would bring it to life and when I opened it, I found the silver cell that had been powering it! Once I replaced the cell the calculator worked like new. The solar cell was merely a gimmick or maybe was just not good enough. Lesson learnt.