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How to check if a new type of charger is harming your laptops battery? (lemmy.zip)
submitted 3 months ago by to c/linux@lemmy.ml
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My current charger is broken, but I found another charger which kind of fits, but im suspicious if it will harm my laptops battery in the long run, what commands can I run or what can I look at to see if a new type of charger is harming a laptops battery? as this isnt usb-c or anything really official.

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[–] 0 points 3 months ago (4 children)

I would say, just check if voltage and and current are the same as your previous charger. If they are, you are OK. If they are lesser than before, you'll charge slower. If they're above, you're gonna harm your battery.

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  • [–] 4 points 3 months ago

    I was taught that it's really only voltage that really needs to match to avoid damage. And even that can be a bit fuzzy with modern electronics and their charging circuitry.

    The wattage and amperage only measures how fast the charger will recharge the battery. There will be a minimum amperage needed to power the laptop... but as long as you exceed the the minimum the laptop will run fine even if the adapter is capable of crazy high Amps. The laptop will only pull what is needed.

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  • [–] 0 points 3 months ago* (last edited 3 months ago) (2 children)

    U = R x I

    volts (U, probably 19VDC) is constant. The laptop has a resistance (R). 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

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