I think some clarification is needed in regards to the term "charger" here. Many modern batteries have a dedicated chip inside, which is controlling it's charging process, collects usage statistics and keeps track of remaining battery capacity (life time wise). Good examples of such batteries are notebook batteries. As the process of charging is controlled by that controller, which is limiting charging current (changing it in different phases of charging process), it's not possible to change charging current by using more powerful power supply. It will work other way around though - less powerful supply will limit the maximum charging current till the moment, when it dies because of overload (if it has no overload protection). ...