The answer to this question is no, you should not attempt to charge a 1A device with a 2A charger. It will take much longer for the battery to be charged and could have an adverse effect on both the devices battery life and overall lifespan. This is due to the fact that there are certain types of chargers that will keep a constant current flowing through the device, while others will use pulse charging methods which vary from this constant current, but still allow for fast charging.