I assume this is the HP Chromebook 11. In my experience it will draw only 0.5A from any charger other than the HP 3A charger. In other words, if you connect it to any charger which causes it to display the Low Power Charger warning, it will behave as if it is connected to a PC USB port. It won't matter if that charger is capable of supplying 1A, 2A, 2.4A or even 3A, it will only draw 0.5A, and it will charge very, very, slowly.