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If a user does not require advanced features (such as graphing) from a Calculator, there are a number of advantages that solar-powered calculators hold over battery-powered ones. The first advantage is that solar-powered calculators never require replacement of batteries. The second advantage is that they are lightweight. The absence of a battery reduces their weight significantly when measuring the battery's weight as a proportion of the calculator's overall weight. The third advantage is that solar-powered calculators generally cost less than battery-powered ones do. There are some disadvantages to solar-powered calculators as well. The main one is that they do not work in low-Light situations. Solar power is also generally an insufficient source of electricity for calculators that are more powerful. Lastly, the display on a solar-powered calculator may be dimmer than the one on a battery-powered calculator. The best solution for those users who do not wish to sacrifice any features in a calculator by choosing either a solar-powered one or a battery-powered one is to buy a calculator that uses both solar power and battery power. These dual-power calculators are very common and are easy to find.