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

• B0rax@feddit.org ⁨1⁩ ⁨week⁩ ago

  But they still have a limited lifetime of a maximum of 10 years, regardless of cycle count.

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  • Boomkop3@reddthat.com ⁨1⁩ ⁨week⁩ ago

    I suppose you’ll have to do a 10$ repair on your decade old keyboard, and recycle the remains

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  • saigot@lemmy.ca ⁨1⁩ ⁨week⁩ ago

    Where are you getting that number? There are many different types of supercapacitors, which cary in lifespan wlquite a bit and the conditions (mostly voltage and temp) also have a big impact. The article doesn’t specify the type of cap used.

    For instance this paper tests a supercapacitor rated for 2.7V at 2.5 and 3v. At 2.5v the cap is estimated to have a lofespan of 100yrs, with 3v scenario it’s 10.

    Keyboards don’t get very hot, and the voltage draw is very predictable so I don’t think designing a long lasting capacitor for this usecase is particularly tricky.

    I would be worried about the lifespan of the solar panel.

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