Power Bank Market by Capacity (1,000–5,000 mAh, 5,001–10,000 mAh, 10,001–15,000 mAh, 15,001–20,000 mAh, Above 20,001 mAh) by Application (Smart Phone, Tablet, Laptop, Portable Media Device, Wearable Device, Digital Camera, Others) , by Region (North America, Europe, Asia Pacific, Latin America and Middle East & Africa): Global Market Assessment, 2021 – 2028