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Joined 2 years ago
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Cake day: October 20th, 2024

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  • U = R x I

    volts (U, probably 19VDC) is constant. The laptop has a resistance ®. This means that the laptop has already dictated the amount of currents (I) that it pulls. You can connect an 100A charger to an phone. The phone dictates howmuch it actually pulling. There is no battery damage/harm in doing so.

    If you charge a battery at full-speed, It can heat up. This is in the long term bad for (Lithium) batteries. That’s where the myth might come from?

    *fixed formula order


  • For USB-C: Tiny little side note here, there are some cheap small-size adapters that overheat. Some adapters thotle down, but some rare ones just blink power on and off, which is bad for lithium batteries.

    Search a good brand, preferably reviewed, and GAN-type. Spend a bit more than the cheapest. Check if it has the right protocol (probably Power Delivery at some voltage) to make sure it charges at a normal speed.

    For a DC charger like OP asked. Match polarity, match Voltage. And at least match the current/watage to make sure you can charge in a reasonable amount of time



  • GAN is not just faster and smaller, it’s side effect is also efficiency.

    But it’s currently still a high end way of going power switching. So it’s more expensive, so not all power supplies use it yet

    House power wise our biggest users are AC appliances (heat pumps) they do not benefit from a more efficient DC adapter. Power chart

    A phone at 5000mah who charges every day from 0-100% would use 5Ax4.2Vx365d = 7,665 Kwh x €0,22 = €1,68 (excluding efficiency loses). This is too small to make reasable investments in phone adapters. But I do see that a better computer power supply (when use regularly) can make a difference to your power bill