boAt EnergyShroom PB 400 Pro 20000mAh Fast Charging Power Bank

A 20,000mAh power bank is the kind of thing you pack at the start of a trip and stop thinking about until you’re back home. The boAt EnergyShroom PB 400 Pro is built for exactly that role — enough capacity to charge most smartphones four to five times over, with the build quality and safety features to do it reliably across different environments. The premium aluminium body distinguishes it immediately from plastic alternatives: it feels substantial without being heavy, and resists the surface damage that cheaper casings accumulate quickly.

Fast Charging and Pass-Through

22.5W two-way fast charging works in both directions — devices charge faster when connected, and the power bank itself recharges more quickly than standard input rates allow. This matters most when you have limited time at a power outlet and need the bank topped up before the next leg of travel. The pass-through charging feature lets you recharge the bank while simultaneously charging connected devices, which removes the need to choose between topping up the bank or keeping your phone alive during a short layover.

Three Devices Simultaneously

The port configuration — dual USB-A outputs and one USB-C two-way port — allows three devices to charge at the same time. A phone, a pair of earbuds, and a smartwatch can all draw power concurrently without one blocking the others. The LED battery indicator shows remaining capacity at a glance, removing the guesswork about whether the bank has enough charge to cover the rest of the day.

Protection and Compatibility

12-layer Smart IC Protection covers overcharging, overheating, short circuits, overcurrent, and overvoltage — the full range of electrical risks that matter in a high-capacity battery. Compatible with smartphones, tablets, TWS earbuds, smartwatches, Bluetooth speakers, and neckbands, the PB 400 Pro handles the full range of daily devices from a single compact unit that fits without complaint into a backpack or handbag.