If you use a higher current rated ampage with your laptop, your battery your battery will lose its charge capacitycapacity more quickly over time than it would with the correct charger. The manufacturers, however, would have you believe otherwise. I have witnessed this time and time again with generic replacement adapters rated at 6 amps amperes used with units rated 3.42 amps amperes. The battery charge capacity always fades to useless in a very short period of time.