I plugged my phone into my laptop charger to see what would happen. My phone on 10% said “charge time 2 mins”. But then after a bit it changed to 45mins.
Does the phone somehow change the power of the charger to a more sensible power?
My phone has a fast charger which is usually “1hr” to fully charge.
In: 5
Assuming that the phone and the charger both implements the USB Power Delivery standard which have become the most common standard then they are able to communicate with each other. They can negotiate the voltage and current based on a number of different things. The high power laptop charger does support higher voltages and current needed to charge laptops, but it also supports the lower voltages and currents that phones need. So the phone will tell the charger to please slow down.
The “2 min” display you got is most certainly a display bug. This might be based on the maximum power output of the charger but the phone does not even support the voltages required for this. The phone battery is just not high enough voltage to accept that charge. You may however experience that the phone starts charging fast and then slows down a bit after some time. This is the thermal protection kicking inn. The phone will monitor the temperature of the battery and if it gets too hot it tells the charger to limit the current.
It is perfectly fine to use a laptop charger to also charge your phone. The standards are intentionally made compatible to allow for this. This means that if you are out on a trip you may only bring your laptop charger and do not need a separate phone charger. Technically it also works the other way and a laptop does work with a phone charger. However because the laptop uses higher voltage batteries it is likely not going to be able to charge from the phone charger. At best you might hope that the laptop will discharge slower when connected to a phone charger.
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