Is it possible to charge a Huawei P8 Lite, which comes standard with a 1Ampere charger, with 2.5A, or does that harm the phone or the battery? My old one is broken and I happen to have one with 2.5A lying around…
Of course I have already interviewed the Internet, but there were contradictory details:
"If the original charger had an ampere rating, it's not a concern for the phone and battery when charging it with a 2-amp charger - but it's a little faster." (https://www.inside-handy.de/magazin/36220-smartphone-handy-akku-laden-tipps#handy-akku-richtig-laden-ladegeschwindigkeit-erhoumlhen)
"Testing has shown that fast-battery performance is significantly lower than conventional 1-amp charging, with up to 20% after 4 months of fast charging." (https://www.computerbild.de/artikel/cb-Tipps-Handy-Smartphone-Akku-laden-Tipps-18115709.html)
Did you maybe have your own experiences?
Can you do that, no problem.
How much ampere a device "needs" it always decides itself. Because power is not given but pulled. Tension, however, is given. Since a cell phone can break. So it's quite possible that your phone charges faster with the 2.5A if it supports faster charging
The tests you mentioned refer to fast charging the battery. The slower you charge the better that is clear but I would not trust these tests for the most part.
By the way, fast-loading is always defined differently. Sometimes it is 5V 2A times it is 9V by 12V and always different power. On my cell phone, for example, Fast Speed means 9V and 1.67A
