This review dives deep into the INIU P63 and P51 power banks, comparing their performance, features, and overall value. We put both models through rigorous testing, charging a range of devices from smartphones to a power-hungry handheld gaming PC, the ASUS ROG Ally. Our tests explored charging speeds, multi-device charging capabilities, and overall battery life extension offered by each power bank. We also assessed their usability and highlighted both advantages and disadvantages based on our real-world experiences. This comprehensive evaluation will help you decide which INIU power bank best suits your needs and charging habits.The INIU P63, with its impressive 25,000mAh capacity and 100W power delivery, is a powerhouse designed for high-power devices. The more compact INIU P51 offers a 20,000mAh capacity and 22.5W power delivery, ideal for everyday use. This review examines the strengths and weaknesses of each, including charging speeds with different wattage chargers, multi-device charging capabilities, and the notable absence of included charging bricks. Read on to discover which INIU power bank emerges as the champion, and whether the compromises are worth the considerable power on offer.
Pros And Cons
- Includes a torch
- Three outputs (two USB-C, one USB-A)
- Charges phone four times from 0% to full in ~90 minutes
- Charges tablet twice from 0% to full
- Significantly extends Switch battery life
- Provides two days of personal heating with a compatible heated jacket in cold conditions
- Does not include a charging brick
- Slow charging time with standard 20W chargers (~4.5 hours)
- Power delivery up to 100W
- Fast charging for Samsung Galaxy S22 Ultra (under 1 hour)
- Massively extends phone battery life during gaming
- Charges multiple devices simultaneously
- Charges phone, smartwatch, and tablet to full from empty using just over half its battery
- Significantly extends Asus Rog Ally battery life (2+ hours of additional gameplay)
- Does not include a charging brick
- Very slow charging time with standard 20W chargers (~6+ hours)
- Requires a 100W charger for optimal charging speed (sold separately at additional cost)
Read more: OUKITEL P2001 PLUS Review: Best Budget Portable Power Station?
INIU P63: Flagship Powerhouse
The INIU P63 E1 is the flagship model, boasting a massive 25,000mAh battery capacity and a powerful 100W power delivery. This makes it capable of charging even the most power-hungry devices, such as handheld gaming PCs.

Its port configuration mirrors the P51, featuring two USB-C ports and one USB-A port, but with the key difference being variable power output per port. This flexibility allows for optimal charging speeds for various devices.

I was particularly impressed by its ability to fast charge my Samsung Galaxy S22 Ultra. The charging speed was remarkable, consistently outperforming my usual Samsung fast charger.

INIU P51: Compact and Powerful
The INIU P51 E2 is a more compact option with a 20,000mAh battery and a 22.5W power delivery. While not as powerful as the P63, it still delivers impressive performance for everyday devices.

It features two USB-C ports and one USB-A port, all delivering the same 22.5W output. This simplicity makes it very user-friendly.

A surprising and welcome feature is the built-in torch, something often overlooked but incredibly useful in various situations.

Real-World Performance and Multi-Device Charging
Both power banks excelled in real-world testing. The P63 easily charged my phone, smartwatch, and tablet simultaneously, demonstrating impressive multi-device charging capabilities.

Even under heavy load, such as gaming and video editing on my phone, the P63 maintained its performance without any issues. The battery life extension was substantial, especially noticeable during mobile gaming sessions.

The P51, while less powerful, still managed to charge my devices efficiently, proving its versatility for everyday use.

Gaming Performance with the ASUS ROG Ally
Testing with the power-hungry ASUS ROG Ally showcased the P63's true potential. It significantly extended the Ally's battery life, allowing for extended gaming sessions.

The P63 provided more than four times the gaming time compared to the Ally's internal battery alone, while simultaneously charging the device. This is a game changer for mobile gamers.

Using the P63 with the ROG Ally dramatically increased portability and usability, overcoming the Ally's inherent battery limitations.
Charging Time and Considerations
The biggest drawback of both power banks is the lack of an included charging brick. This necessitates using an existing charger, which can lead to significantly longer charging times, especially with lower-wattage chargers.

The P63, requiring a 65W charger for optimal charging, took over six hours to fully charge using a 21W charger. The P51, while faster, still took around 4.5 hours.

This lengthy charging time is a major inconvenience and offsets the benefits of their high capacity.

Conclusion and Verdict
The INIU P63 and P51 power banks offer excellent performance and capacity for their respective power outputs. The P63 is a powerhouse, ideal for power-hungry devices, while the P51 is a more compact, everyday solution.

However, the lack of included chargers is a major drawback, significantly impacting their usability. While the P51 is more forgiving with its charging requirements, the P63's long charging time with standard chargers is a significant issue.
Ultimately, the decision depends on individual needs and existing charging infrastructure. For those with high-wattage chargers, the P63 offers unparalleled power and capacity. The P51 is a solid choice if fast charging isn't a top priority.