Review: Xiaomi Power Bank 4i – 20,000 mAh, 33 W

🔍 Overview

• Capacity: 20,000 mAh (≈74 Wh), comprising two 10,000 mAh cells—airline-approved under 100 Wh regulations
• Design: Matte ABS+PC shell with textured, anti-fingerprint finish; includes an integrated USB‑C cable plus one USB‑A and one additional USB‑C port
• Ports: 3 outputs (USB‑A + USB‑C integrated + USB‑C) and 2-way PD input/output support up to 33 W
• Safety: Includes 12-layer protection—covering overcharge, over-discharge, temperature, and short-circuit safeguards
• Certification: BIS certified and manufactured locally in India

⚙️ Real-World Performance

• Fast-charging output: Delivers up to 33 W PD; charges modern phones up to ~56–60 % in 30 minutes
• Dual-device charging: Simultaneously powering two devices shows stable output (up to 5.1 V/3.6 A across ports)
• Recharge time: Approximately 6.9 hours with 9 V/2 A adapter, or up to ~10.5 hours via 5 V/2 A
• Capacity efficiency: Effectively holds rated capacity; ~4 full charges for typical 4,000 mAh smartphones
• Heat handling: External temps remain moderate (<90 °C casing), even during rapid input/output cycles

👍 Strengths

• High capacity: 20 k mAh supports multiple charge cycles for phones, tablets, and wearables
• 33 W fast charging: Enables quick power-ups for PD-compatible devices
• Built-in cable: Convenient for travel and eliminates extra clutter
• Premium build & safety: Textured shell, solid grip, 12-layer circuit protection
• Reliable value: Priced competitively relative to features and certification
• Local certification: BIS endorsement assures compliance and safety

👎 Limitations

• Weight: At ~440 g, it’s on the heavier side for pocket carrying
• No display: Four-LED indicator only—no exact percentage readout
• Single-sided durable cable: Only the integrated USB‑C cable doubles as input/output; other cable requires PD-quality compliance

✅ Verdict

The Xiaomi Power Bank 4i (20k mAh, 33 W) delivers a powerful blend of high capacity, fast charging, and smart design—all in a well-protected and travel-friendly shell. It’s an excellent option for frequent travelers, content creators, or anyone managing multiple devices.