Anker has unveiled 2 new portable chargers for the Nintendo Switch. Both the 20100 mAh and 13400mAh power banks are officially licensed by Nintendo so rest assured that your Switch will be safe
The 20100mAh is expected to charge your Switch four and a half times before needing a recharge and will set you back ¥9,980. The 13400mAh one is expected to charge your Switch three times before needing a recharge and will set you back ¥6980.
You can find out more about the powerbanks here.