Is charging at 100W safe for the battery?

Okay, so we all know the drill: fully charging and emptying your battery is bad as well as heat.
We know as well that the original Framework power adapter supplys 60w but that the laptop can handle up to 100w.
Maybe I am just stupid and charging at 100w automatically equals to more heat but having seen MKBHD’s video on fast charging it appears to me, that maybe the charger can handle the surplus of heat etc.

The whole reason why I am asking is, that I consider buying the Volta GIGA GaN charger ( GIGA: The Ultimate Universal GaN Charger | Indiegogo ), that can output 200w. Well, I am still struggling whether to back their campaign…

IIRC the battery will charge at most 60W even if you use a >60W charger. So no difference in battery degradation.

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@feesh Do not know where they stated this?
In the post about USB C charging they just said “yes we support USB-C Charging from most chargers up to 100W.”
So unsure, what that means…

@feesh has it right as usual. The battery will charge at 60W maximum.

If you use a 100W charger the rest of the laptop can use the extra power but the battery will still be charging at 60W (20V @ 3A) no matter what. It will allow the CPU/iGPU to boost while the battery is charging though.

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Thanks a lot @Fraoch !
So if I understand you correctly with a 100W charger I might get an extra boost in performance and still charge the battery at the max 60W, while charging my phone through my laptop, but I won’t damage the battery or charge any faster than using a 60W charger?

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Yes the battery charge rate is limited by the laptop to a maximum, as are all laptops, phones etc.

Having more power available is good for the charger as it isn’t pushed to the limit, if just charging, but as mentioned you can draw extra to run whilst charging.

And you are right about heat. It is far more damaging that fully charging slowly. To that end charging at full rate and loading the CPU etc will produce more heat and that will do the battery no good.

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Yes, but charging your phone through the laptop is a new one. It might end up siphoning off any additional power. You would be much better off using a multi-port charger and charging each device individually.

We are talking about USB PD here. A USB PD device will negotiate with a USB PD source like @amoun mentioned in your other thread. The Framework laptop requests 20V from the charger - a 60W USB-PD charger will supply 20V at up to 3A (=60W) while a 100W USB-PD charger will supply 20V at up to 5A (=100W). Keep in mind devices only use as much current as they need - hence the “up to” wording. The power isn’t pumped into the laptop whether it needs it or not, a voltage source is presented and the laptop draws as much current as it needs. It can draw up to 5A in the case of a 100W charger, but the battery can never draw more than 3A due to the charging circuit design in order to prevent battery damage.

So that 200W charger you’re looking at will supply 100W at most to the Framework laptop. That’s 50% capacity. It will not be strained and it should run fairly cool.

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Absolutely, operating a power supply right at its upper limit maximizes the heat it generates and increases the chances of failure.

Better to be at 50-60% capacity than right at 100% continuously!

“Safety margin”. :wink:

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