How many laptop charges does a 20,000mAh power bank give?

A 20,000mAh (72Wh) power bank provides about 1 full charge for a MacBook Air or 60-70% for a MacBook Pro 14. Actual results vary based on laptop usage during charging and conversion efficiency (~85%).

Can I charge a laptop while using it?

Yes — if the power bank's wattage matches or exceeds your laptop's draw, it will charge while you work. If it's lower, it will slow the discharge rate. A 100W power bank handles most ultrabooks while in use.

Best Laptop Power Banks 2026