- Xiaomi Power Bank 4i 20000mAh 33W Super Fast Charging PD |Smart 12 Layer Protection|Type C Input & Output|Triple Output Ports|Supports Android,Apple, Tablets, Earbuds,Watch(MI Powerbank),Blue

Nice powerbank does the job also support fast charging on Samsung phones. But with time it's charging quality or something degrade cause at initial it work well charge the battery even while using phone but after some months it can't charge the battery while using. The charging percentage goes slowly up while using or stay at same percentage on which you plug the Powerbank. The top material is good for price but not as strong as metal body provided by Xiaomi in 10000mah models they are so strong. And it is a bulky power bank feels heavy weights nearly two smartphones. The c to c cable is decent but not as good as braided ones but support fast charging. And you can also use it for charging powerbank. Only major flaw is if there was two type C ports it would be good. But still serves the purpose and done the job well then expected. One thing more it heats while getting charge and also gets the charger a lot so use a GaN charger or avoid over charging though it has protection but prevention is better than cure.

For a normal charger it will take one day or one of the day or maybe today I have 100 words charger it taken about 15 hours to charge completely at my first charge all over product is okay and I like this colour etc weight is his also okay it is useful at long trips or emergency usage it is compatible and various devices which is not mention it in the list

I have been using the Xiaomi Power Bank 4i for regular day-to-day use, and overall I am very satisfied with its performance. The 20,000mAh capacity is its biggest advantage. It provides plenty of backup for phones and other small devices, making it especially useful while travelling or during power cuts. The build quality feels solid, and the multiple ports are convenient when charging more than one device. The USB-C output provides good fast-charging performance with compatible devices. In my testing, charging speeds were noticeably better than a basic 10W power bank, although the actual speed depends on the phone, cable and charging protocol. The advertised 33W output should therefore not be interpreted as 33W for every device. Recharging the power bank itself can take several hours depending on the charger used. Using a compatible higher-power charger is recommended if you want to take advantage of its faster input capability. The only minor downside is its weight and size, which are expected for a 20,000mAh power bank. Overall, this is a reliable and versatile power bank with good capacity, solid build quality and fast-charging support. A good choice if you prioritise battery capacity, reliability and versatility over the absolute fastest proprietary charging for a particular phone. Pros: 20,000mAh capacity Up to 33W output USB-C fast charging Multiple ports Good build quality Useful for travel and power cuts Good value for a high-capacity power bank Cons: Relatively heavy Full recharge takes several hours Maximum charging speed depends on device and charging protocol Overall: 4.5/5

I’m quite satisfied with the Xiaomi 20000mAh Power Bank 4i. The build quality feels solid, and the 20000mAh capacity is more than enough for daily use and travel. It provides good charging speed and can comfortably keep my phone powered throughout the day. The power bank is well-designed and feels reliable. I also like that it has multiple charging options, making it convenient when charging different devices. Overall, it’s a good power bank for anyone looking for a reliable 20000mAh option with good performance and value for money. Recommended for daily use and travel.

Good but heavy

I am giving this review after one year, so I can say this is the best power bank; you can blindly buy this product and be amazed by its performance. It is highly durable with minimal heat; it is not compact in size, but the battery backup is great.

Really happy with this power bank! The 20000mAh battery provides good backup, and the 33W fast charging is very useful. It supports fast charging for my phone only with Type-C output

Capacity: 20K is enough for me. I charged my 4500maH phone a total of 2 times and it dropped 2 points to 2 leds lights blinking Charging the power bank takes expected amount of time: I did not measure the time to full charge - but i did charge from 1 led light to fully charged and it took ~5 hours to do so (67W xiaomi charger + 6A xiaomi cable) It gets slightly warm when charging on the ports side, almost no heat when using the powebank itself. The body of the powerbank scratches easily - just sliding it on a desk if there is dust there are will be visible scratches marks (image with xiaomi logo), as expected on a plastic body Its heavy but manageable - which is expected on a 20000mAh PB Lookwise its good and looks minimal I dropped it once and it survived and works just fine - the corner it fell has slight dent thats it (image with the ports). So build wise its good Regarding Fast Charging On the xiaomi site they say it can charge Dual ports as 5V;3A that is 15W of fast charging for dual port usage But every time i plug a second device - the powerbank automatically restarts iself and starts charging in normal mode (as per the phone) - there is no indication of fast charging on the phone. So can't tell if its charging with 15W or not. Maybe phones do not recognize 15W as fast charging, not sure I tried it with 3 Xiaomi phones with different fast charging supports (67W, 33W and 18W fast charging) and with 3A, 6A and included cable in all different port combinations. All of them were Xiaomi official products The result is the same plugging the second device in the power bank restarts in slow charging mode Another annoying thing is - this same behavior repeats if u plug in a cable with E-marker chip. It detects cable is plugged in the port and immediately drops the fast charging. (In the video i have used a 6A Xiaomi cable , the phone supports 67W - as u can see it resets and starts charging in normal mode just by pluggin in the cable itself). This does not happen with normal cables - but plugging in another device will drop the fast charging. And simply unplugging doesn't work, I have to reset it again by pressing the button on the power bank so it starts fast charging again I observed charging speed and can't tell conclusively if its just 10W normal charging or 15W charging. But charging speed is significantly slower if two or more devices are connected compared to if single device is connected. But its not super slow, its about the same speed as a standard 10W charger. Included cable is type C to C. The Type-C port on the powerbank charges the phone slightly faster, compared to the type A ports. The Low current mode implementation is based on current draw - so u can't slow charge your phone even if u wanted. Becuase anything that draws high enough current is plugged in, it exits from its lower power state into normal state I tried with cable with no data lines same result - it exits low current mode. Low current mode does work with earphones and headphones but u plug in any other device that draws big current like smartphones it will exit its low current state Rest every thing is upto specs. I brought it when its price was high Rs 2199 - its usual price at this time is 1999 (May 2026) For me the power bank is more than enough - the non dual fast charging doesn't bother me. But there could be more clarification on fast charging and low power mode behavior, which are the supported chargers that can charge it at max speed. Overall the powerbank is good enough for almost every use case.