Most Compact 10,000mAh Power Bank by FahanTech (Red Aluminum) Most compact 10000mAh power bank Size: Super compact size, only slightly larger than a credit card Battery: Bulit-in 3xLG3350mAh high-density cells Fast Charge : Dual USB output (Max 2.1A output)- Charge 2 devices simultaneously Safety: Multi-layer protection design with both software and hardware protection.