Comment on New breakthrough may let us charge smartphones in 60 seconds

• ColdCreasent@lemmy.ca ⁨4⁩ ⁨weeks⁩ ago

  Impossible for battery health to be at 100% after years. May still be working great, but not 100%.

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  • boonhet@lemm.ee ⁨4⁩ ⁨weeks⁩ ago

    Battery degradation is ridiculously unpredictable. I’ve seen 100 cycle batteries at 75% and 2500 cycle batteries over 90%. I only dealt with like 5 MacBook models

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    • ColdCreasent@lemmy.ca ⁨4⁩ ⁨weeks⁩ ago

      Agreed, but not a “charge overnight for years” but no degradation at all.

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      • areyouevenreal@lemm.ee ⁨4⁩ ⁨weeks⁩ ago

        Depending on what battery protection modes are in play, many have smart charging or other features designed to prolong life. Also a fair few batteries come out with greater than design capacity from the factory. It’s called a design capacity and not an absolute capacity for a reason. A phone battery that left the factory at 110% could conceivably still be at or above 100%.

        Fyi it’s not overnight charging that’s the issue either, it’s charging to 100%. What one device consider 100% varies and devices will essentially lie to you about it. 4.2V is normally considered 100% full for Lithium Cobalt Oxide batteries yet some devices push higher than this while others skirt under to pad capacity and cycle life respectively. It’s about tradeoffs.

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