I’ve been on the hunt for a reliable, high-capacity power bank that doesn’t break the bank (pun intended). After scrolling through countless options, the Xiaomi Power Bank 4i caught my eye—20000 mAh, 33 W fast charging, triple ports, and Xiaomi’s reputation for quality. But does it live up to the claims? I tested it for a week, and here’s my honest, no-bias review.
Xiaomi Power Bank 4i – Unboxing & First Impressions
Packaging & Design
- Sleek, minimalist Xiaomi packaging—no flashy gimmicks.
- Sandstone texture on the power bank gives a premium, grippy feel.
- Compact for a 20000mAh bank (18.9 x 9.7 x 3.2 cm, 440g).
What’s in the Box?
- Power Bank 4i (Classic Black)
- USB Type-C cable (short but sturdy)
- User manual (basic but clear)
Xiaomi Power Bank 4i – Key Features—What Stands Out?
1. 33W Super Fast Charging (Input & Output)
- Charges phones blazing fast (50% in ~30 mins for a 4000mAh device).
- Supports Power Delivery (PD) & QC 3.0—works with Android, iPhone, tablets, earbuds.
2. Triple Ports for Multi-Device Charging
- 1x USB-C (input/output), 2x USB-A—charge 3 devices simultaneously.
- Smart power management auto-adjusts output.
3. Massive 20000mAh Battery
- Real-world performance:
- ~4 full charges for a 4000mAh phone.
- 2-3 charges for larger devices (iPad, tablets).
4. Safety Features
- Short-circuit protection
- Overheating prevention (stays cool even at 33W).
Xiaomi Power Bank 4i – Real-World Testing—How Does It Perform?
Charging Speed Test
- With an included Type-C cable:
- 0-50% in 30 mins, 0-80% in ~1 hour (4000mAh phone).
- With older cables: slower (~1.5-2 hours for 80%).
- Lesson: Use a high-quality cable for max speed!
Battery Backup Test
- Total output: ~406% (multiple partial charges) before needing a recharge.
- Efficiency: ~70-75% real capacity (typical for power banks).
Recharging the Power Bank
- With a 10W charger: ~11-12 hours (slow but safe).
- With a 33W+ charger: ~4-5 hours (much faster).
Xiaomi Power Bank 4i – Pros & Cons—The Brutal Truth
👍 Pros
✔ Blazing-fast 33W charging (when using the right cable).
✔ 20000 mAh = Reliable multi-day backup.
✔ Triple ports for charging multiple devices.
✔ Sturdy build (sandstone finish, no cheap plastic feel).
✔ Good safety features (no overheating issues).
👎 Cons
❌ Heavy (440g)—not the most travel-friendly.
❌ No percentage display (only 4 LED indicators).
❌ Slow self-recharging with low-wattage adapters.
❌ Not truly 33W in all cases (closer to 25W with some devices).
Xiaomi 4i vs. Competitors
| Feature | Xiaomi 4i | Ambrane 20000mAh | Amazon Basics 20000mAh |
|---|---|---|---|
| Fast Charging | 33W PD/QC 3.0 | 20W | 18W |
| Ports | 3 (Type-C + 2x USB-A) | 2 (USB-A + Micro-USB) | 2 (USB-A + Type-C) |
| Build Quality | Sandstone texture | Plastic | Plastic |
| Weight | 440g | 380g | 350g |
| Price | ₹1,999-₹2,499 | ₹1,699 | ₹1,499 |
Verdict: The Xiaomi 4i wins on speed & build, but if you want lighter options, consider alternatives.
Who Should Buy This? (And Who Shouldn’t)
✅ Best For:
- Frequent travelers needing multi-day power.
- Multi-device users (phone + tablet + earbuds).
- Fast-charging lovers (33W is a game-changer).
❌ Avoid if:
- You want ultra-portability (it’s heavy!).
- You need a percentage display (LEDs are basic).
- You’re on a tight budget (cheaper 20000mAh options exist).
Final Verdict—Is It Worth It?
Rating: 4.3/5
- Great for heavy users, but not perfect.
- Best in class for fast charging & build quality.
- Worth the price if you need reliability.
Where to Buy?
🔗 Official Xiaomi Store (Link)
🔗 Amazon India (Link) (Look for discounts under ₹2,000).
FAQs
1. Does it support iPhones?
Yes! Works with iPhones (PD compatible) but won’t hit 33W (Apple limits speeds).
2. How many charges for a 5000 mAh phone?
~3.5 full charges (real-world usage).
3. Can I carry it on a flight?
Yes! 20000 mAh is within airline limits (usually ≤27,000 mAh allowed).
4. Does it overheat?
No major heating issues, even at 33W charging.
5. Is the included cable good?
Yes, but for max speed, use a high-quality Type-C cable.
Final Thoughts
The Xiaomi Power Bank 4i is a solid, fast-charging beast with great build quality—ideal for power users. Just be ready for its weight and basic battery indicators. If you need speed & reliability, this is a top pick in 2025.
Have questions? Drop them below! 🚀
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