We can bring our notebooks/laptops around the world now and they should work on normal household power around the world. All we need it the right plug (or a right cord from wall to charger).
The battery pack won't tell you the household voltage, only the charger or power supply/adapter unit (PSU) does. You can turn the charger up-side-down to read its label (very hard to read) which should say many information including
Input 110V-240V or similar,
Output 45W (or some voltage and ampere)
In short. You can use your machine in the US, you only need a cord which you can buy from a good electrical or computer shop. You can also use a tourist adapter which you can buy from may international airports.
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