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2. Solar-powered flashlight - Wikipedia

   en.wikipedia.org/wiki/Solar-powered_flashlight

   A solar flashlight with built-in radio. Solar powered flashlights (American English) or solar powered torches (British English) are flashlights powered by solar energy stored in rechargeable batteries. Most of these flashlights use light-emitting diodes lamps [1] [2] since they have lower energy consumption compared to incandescent light bulbs. [3]

3. Solar lamp - Wikipedia

   en.wikipedia.org/wiki/Solar_lamp

   A garden solar lamp A child in Zambia studying by the light of a lamp charged by solar power during the day. A solar lamp, also known as a solar light or solar lantern, is a lighting system composed of an LED lamp, solar panels, battery, charge controller and there may also be an inverter.

4. Solar-powered calculator - Wikipedia

   en.wikipedia.org/wiki/Solar-powered_calculator

   Solar-powered calculators are hand-held electronic calculators powered by solar cells mounted on the device. [1] They were introduced at the end of the 1970s. [2]Amorphous silicon has been used as a photovoltaic solar cell material for devices which require very little power, such as pocket calculators, because their lower performance compared to conventional crystalline silicon solar cells is ...

5. Mechanically powered flashlight - Wikipedia

   en.wikipedia.org/wiki/Mechanically_powered...

   The best designs use a supercapacitor instead of a rechargeable battery, since these have a longer working life than a battery. This, along with the long-life light-emitting diode which does not burn out like an incandescent bulb, give the flashlight a long lifetime, making it a useful emergency light. A disadvantage of many current models is ...

6. Lithium–sulfur battery - Wikipedia

   en.wikipedia.org/wiki/Lithium–sulfur_battery

   [2] [4] [1] Li–S batteries offer specific energies on the order of 550 Wh/kg, [1] while lithium-ion batteries are in the range of 150–260 Wh/kg. [5] Li–S batteries with up to 1,500 charge and discharge cycles were demonstrated in 2017, [6] but cycle life tests at commercial scale and with lean electrolyte have not been completed. As of ...

7. How long do electric car batteries last, and can they ... - AOL

   www.aol.com/news/long-electric-car-batteries...

   It's also reasonable to expect a battery to last longer than that. Tesla's Impact Report for 2022, for example, states that its battery packs only have 12% degradation at 200,000 miles.