À priori, un chargeur de 45 ou même 65 w chargera comme le chargeur d'origine, ni plus ni moins car la batterie n'aceptera pas l'ampérage le plus élevé.
lire ça trouvé ici écrit par un spécialiste
"First off, 4500mAh does mention a capacity. But the actual energy content also requires a knowledge about the voltage. One cell that holds 4500mAh has half the amount of energy and halve the voltage of a bigger battery that has two 4500mAh cells in series. And a third the energy content of a battery with three cells (and so three times the voltage) in series.
Secondly, charging time depends on actual charging current. And not all batteries are made the same. So it isn’t obvious how quickly the batteries will charge.
Thirdly - 65W is a big charger if you are talking about a phone. But a quite small charger if you are talking about a laptop. But if we assume from the tags you are talking about a mobile phone, then the battery will not be charged with 65 W. It’s more likely the phone may charge with 10–15 W. And how much energy that ends up in the battery will then also depend on if the phone is on or off. If it’s on and you are gaming on the phone, then the phone itself will consume some of the power from the charger. And the heat from the CPU + graphics together with the heat from the charging battery is likely to force the phone to step down the charging speed even further to keep the temperature under control"
