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Comment on Look Ma, No Batteries! Hands On With Lenovo's Self-Charging Keyboard

howrar@lemmy.ca ⁨1⁩ ⁨week⁩ ago

Unlike conventional batteries, supercapacitors have an exceptionally long lifespan, lasting hundreds of thousands of charge-discharge cycles, whereas lithium batteries typically last only five years or less.

So, what’s the conversation rate between charge-discharge cycles and years?

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Flipper@feddit.org ⁨1⁩ ⁨week⁩ ago
It doesn’t say what type of capacitor is used, but electrolytic capacitors can basically be charged and discharged indefinitely. They don’t wear down . However they age based on temperature. The ones at my work have 2000h @ 105°C. For every 4 °C coolor the lifetime doubles as a rule of them.

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- Isoprenoid@programming.dev ⁨1⁩ ⁨week⁩ ago
  
  It doesn’t say what type of capacitor is used
  
  Yes, it does. They’re supercapacitors.
  
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Isoprenoid@programming.dev ⁨1⁩ ⁨week⁩ ago
It says in the article

Unlike conventional batteries, supercapacitors have an exceptionally long lifespan, lasting hundreds of thousands of charge-discharge cycles, whereas lithium batteries typically last only five years or less.

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