boAt EnergyShroom PB400 offers 20000mAh capacity and 22.5W fast charging. Read our full review to see if it is the right power bank for you.
boAt EnergyShroom PB400 20000mAh Power Bank Overview
Running out of battery on your phone is frustrating. Whether you are traveling, working from nowhere, or just stuck in a long queue, a dead phone can ruin your day. The boAt EnergyShroom PB400 power bank promises to solve this with its 20000mAh capacity and 22.5W fast charging. But does it really deliver?
In this review, I will break down everything you need to know about this power bank. From its specs to real-world performance, safety features, and where to buy it, this guide will help you decide if the PB400 is the right portable charger for you.
boAt Energyshroom PB400 Power Bank Price
The boAt Energyshroom PB400 Power Bank featuring 20000mAh capacity and Smart IC protection for just ₹1,699.
What Is boAt EnergyShroom PB400?
The boAt EnergyShroom PB400 is a high-capacity portable power bank from boAt Lifestyle, a brand known for affordable audio and accessories. It packs a 20000mAh Li-ion polymer battery that can charge multiple devices multiple times before needing a recharge itself.
This power bank targets users who need reliable backup power for smartphones, tablets, smartwatches, earbuds, and other USB gadgets. With its sleek aluminum casing and compact design, it's built for both daily use and travel.
Battery Capacity: Can It Really Charge Your Phone 4–5 Times?
The BoAt EnergyShroom PB400 comes with 20000mAh at 3.7V and 74Wh of total battery capacity. But here's the thing: the actual usable capacity is lower due to voltage conversion.
The total capacity is 20000mAh at 3.7V which equals 74Wh. The rated capacity is 13500mAh at 5.0V (TYP 2A). The battery type is Li-ion polymer.
The rated capacity of 13500mAh means you'll get roughly 65 to 70 percent of the advertised capacity in real use. For a typical 5000mAh smartphone battery, that's about 2.5 to 3 full charges. For smaller devices like earbuds or smartwatches, you'll get 10 or more charges.
Fast Charging Performance: 22.5W PD and Quick Charge Support
One of the PB400's biggest selling points is its 22.5W fast charging output. This supports both Power Delivery and Quick Charge 3.0 protocols, which means faster charging for compatible devices.
Smartphones with PD or QC support can charge up to 50 percent in just 30 minutes. Tablets get faster charging than with standard 5W or 10W power banks. You can also charge multiple devices simultaneously via the two USB-A ports.
The fast charging works through 2 USB-A output ports and 1 Type-C two-way port, giving you flexibility in how you connect your devices.
Port Selection: How Many Devices Can You Charge at Once?
The boAt EnergyShroom PB400 power bank offers a well-rounded port configuration that gives you lots of options.
You get 2 USB-A output ports for charging smartphones, tablets, and earbuds. There is 1 Type-C port that supports two-way charging for both input and output. You also get 1 Micro-USB port that works only for input to charge the power bank itself.
This means you can charge up to 3 devices simultaneously using 2 USB-A ports plus 1 Type-C port. The Type-C port is particularly useful since it supports two-way charging, meaning you can use it to charge the power bank itself or charge Type-C devices like newer smartphones and laptops.
Safety Features: 12-Layer Smart IC Protection Explained
Safety is a major concern with high-capacity power banks. The PB400 addresses this with 12-layer Smart IC Protection, which includes several important safety measures.
Battery overcharge protection prevents the power bank from charging beyond its limit. Over-discharge protection stops the battery from draining too low. Short circuit protection guards against electrical faults. Temperature control prevents overheating during fast charging. Voltage stabilization ensures consistent power output.
This multi-layer protection ensures your devices stay safe while charging, especially during long charging sessions or when using fast charging mode.
Design and Build Quality: Sleek Aluminum Casing That Feels Premium
The PB400 doesn't look like a cheap plastic power bank. It features a sleek aluminum casing that feels premium and durable.
The dimensions are 144.94 by 66.02 by 27.1 millimeters. The width is just 28mm which makes it compact. The weight is 449 grams. The casing is made of aluminum. You can choose from Carbon Black or Steel Blue color options.
At 449g and 28mm width, it's compact enough for a backpack or travel bag, though it's a bit heavy for everyday pocket carry. The aluminum build also helps with heat dissipation during fast charging.
Real-World Performance: What Devices Does It Work With?
The PB400 works with almost any USB-powered device you might have.
For smartphones, it works with iPhone, Samsung, OnePlus, Xiaomi, Realme, and many others. For tablets, it supports iPad, Samsung Galaxy Tab, and Lenovo tablets. It also charges smartwatches like Apple Watch, Samsung Watch, and boAt own smartwatches.
For earbuds, you can charge AirPods, boAt earbuds, and OnePlus Buds. It also works with gaming devices like PlayStation accessories and Nintendo Switch. Plus it supports other USB gadgets including cameras, portable speakers, and portable fans.
The 22.5W output is enough for most smartphones and tablets, but it won't charge high-power laptops that need 45W or higher chargers.
Also Read: Mi 20000mAh Power Bank 3i Price, Features 18W Fast Charging
Where to Buy and Price: Is It Affordable in 2026?
The boAt EnergyShroom PB400 is available at multiple Indian and international retailers.
You can buy it from Croma where it's in stock. It's also available on Flipkart. You can purchase directly from the boAt official website. IndiaMART offers wholesale options for bulk buyers. JioMart also has it available.
The price is around ₹1,499 in India. This makes it one of the most affordable 20000mAh fast-charging power banks on the market.
For international buyers, prices vary by region but typically range between 20 to 30 USD.
Warranty and Customer Support: What's Covered?
boAt offers a 1-year domestic warranty on the PB400. This covers manufacturing defects and battery issues, but not physical damage from drops or water exposure.
For support, you can contact the boAt official support website. You can also reach their customer care via their website or visit authorized service centers in India.
The warranty is standard for power banks in this price range, and boAt has a decent reputation for customer service.
Pros, Cons and Bottom Line
Here are the main pros you should know about. The 20000mAh capacity charges phones 2 to 3 times fully. The 22.5W fast charging with PD and QC support is excellent. You get 4 ports for charging multiple devices. The 12-layer Smart IC Protection keeps everything safe. The premium aluminum build feels durable. And the affordable price at ₹1,499 is a major plus.
Now here are the cons to consider. The weight of 449g is heavy for pocket carry. The rated capacity is only 13500mAh usable which means 65 to 70 percent efficiency. And there is no laptop charging support since 22.5W is not enough for high-power laptops.
The bottom line is clear. The boAt EnergyShroom PB400 is a great value power bank for anyone needing reliable backup power for smartphones, tablets, and small USB devices. Its 22.5W fast charging, multiple ports, and safety features make it stand out in the budget segment.
If you are traveling, working remotely, or just want peace of mind against dead batteries, this power bank is a smart buy. At ₹1,499, it's one of the best affordable 20000mAh options available in 2026.
Also Read: Xiaomi Launches 20000mAh 33W Fast Charging Power Bank
FAQs
Q. How long does it take to fully charge the PB400?
About 8 to 10 hours with a 2A charger via Micro-USB or Type-C input.
Q. Can I charge my laptop with this power bank?
No, 22.5W is not enough for most laptops. It's best for phones and tablets.
Q. Does it support pass-through charging?
The PB400 Pro variant supports pass-through charging, but the standard PB400 may not.
Q. Is the Type-C port reversible?
Yes, the Type-C port is two-way and supports reversible plugging.
Q. What cable comes included?
A Type-C cable is included in the box.
Ready to stay powered up? Check out the boAt EnergyShroom PB400 on Croma, Flipkart, or the official boAt website.
