Choose a capacity based on your device’s battery size and usage needs. For daily use, 10,000mAh is common; for travel or multiple devices, consider 20,000mAh or more.

Yes, most modern power banks have multiple output ports, allowing you to charge two or more devices simultaneously.

It depends on the capacity and charging input speed. Smaller ones may recharge in 3–4 hours, while larger ones can take 6–10 hours.

It’s generally safe if the power bank has built-in protection features, but it may slightly increase heat and slow charging speed.

Yes, they slowly lose charge over time, usually around 2–5% per month. It’s best to recharge them every few months if unused.