A power bank (portable charger) is a compact, rechargeable battery device that stores electrical energy and delivers it to smartphones, tablets, or other USB-powered electronics when no wall outlet is available.
Key Features & Specifications
1. Capacity
- Measured in mAh (milliampere-hours).
- 5,000–10,000mAh: Charges a phone 1–2 times.
- 20,000mAh+: Powers laptops or multiple devices.
2. Output Ports & Speed
- USB-A (standard), USB-C (fast charging), Qi Wireless (cord-free).
- PD (Power Delivery): Rapid charging for compatible devices (e.g., iPhones, MacBooks).
3. Input Charging
- Recharges via USB-C/Micro-USB (faster models support 18W+ input).
4. Safety Protections
- Prevents overheating, overcharging, and short circuits.
Top Use Cases
- Travel: Backup power for flights/road trips.
- Outdoor Adventures: Hiking, camping (solar-powered options available).
- Emergency Backup: Dead phone batteries during outages.
- Work/School: All-day power for laptops/tablets.
Types of Power Banks
| Type | Best For | Example Models |
|---|---|---|
| Pocket-Sized | Phones, quick top-ups | Anker PowerCore 10K |
| High-Capacity | Multi-device/laptop charging | INIU 65W 20000mAh |
| Solar-Powered | Off-grid use (slow recharge) | Blavor Solar Charger |
| Wireless | Qi-compatible phones | Mophie Snap+ 10K |