Must-read if you're unsure about choosing a mobile battery! Manufacturer product guide by function and scene

Everyone experiences the frustration of running out of battery on smartphones, tablets, or laptops. A mobile battery pack becomes a reliable companion when you’re on the go. However, with countless products on the market, varying in capacity, charging speed, size, and features, choosing the right one can be overwhelming.

In this article, we thoroughly evaluate 10 popular mobile batteries sold by multiple manufacturers, based on actual specifications and usability. We will share key points to consider when purchasing and provide information to help you find the best device to meet your needs.

Evaluation Target: Exploring the capabilities of 10 carefully selected products from 49 items

We investigated a total of 49 products, including the latest offerings from mobile battery manufacturers and bestsellers on Amazon, Rakuten Ichiba, and Yahoo! Shopping. The evaluation focused on five key points:

• Actual usable capacity: Measuring discrepancies between listed and real capacity
• Portability assessment: Judging usability based on thickness, surface area, and weight
• Charging speed for smartphones: Comparing actual maximum output
• Efficiency of charging the device itself: Evaluating how input power shortens charging time
• Wireless charging performance: Testing practicality with compatible devices

Top 5 Featured Products with the Highest Ratings

Reliability of capacity: No.1 — SMARTCOBY Pro SLIM CABLE (CIO)

Score: 4.6 / Cheapest Price: ¥5,980

A flagship mobile battery that balances slimness and large capacity. It features an integrated USB Type-C cable, eliminating the need to carry a separate cable.

Its standout feature is maintaining a high actual capacity at 75.98% of the listed capacity. While some competing products fall significantly short of their stated capacity, this device delivers the expected number of charges.

With a thickness of just 1.8cm and a surface area of 63.77cm², it fits comfortably in pockets or bags. It won’t be cumbersome to carry alongside your smartphone.

It also boasts excellent charging capabilities, with a measured maximum output of 39W, enabling quick power delivery to smartphones and tablets. The input power is high at 35W, allowing the battery to recharge quickly—perfect for last-minute charging before heading out.

Multi-tasking performance for simultaneous charging: SMARTCOBY TRIO (CIO)

Score: 4.59 / Cheapest Price: ¥6,970

A mobile battery designed specifically for charging multiple devices at once, equipped with three ports. It has a large capacity of 20,000mAh and supports high output of 67W.

With two USB Type-C ports and one USB-A port, it can charge smartphones, laptops, and earbuds simultaneously. Ideal for business trips or travel.

The measured actual capacity is 75.23%, with minimal deviation from the listed capacity, demonstrating performance close to the nominal value.

At 3.0cm thick, it’s slightly bulkier but still compact with a surface area of 65.68cm², making it easy to store in bags or pockets. It delivers a maximum of 71W, supporting fast charging for smartphones and making busy mornings more manageable.

A portable and well-balanced option: SMARTCOBY Pro SLIM (CIO)

Score: 4.54 / Cheapest Price: ¥4,818

A 10,000mAh capacity mobile battery with a slim profile of just 16mm thickness. It features three USB-C ports for charging multiple devices simultaneously.

The surface has a textured finish that resists scratches, preventing appearance deterioration over long-term use. Its slimness makes it unobtrusive to carry with your smartphone daily.

The actual capacity measured at 69.47% confirms it can deliver the expected number of charges. It supports fast charging with a maximum of 38W, quickly restoring your smartphone’s battery. The input power of 35W shortens the charging time of the device itself.

Display & compactness: Uno Built-in Cable Mobile Battery (UGREEN)

Score: 4.53

A mobile battery with an integrated USB Type-C cable that allows three devices to be charged simultaneously. It features a real-time display of remaining battery level, making it easy to monitor.

Maintaining a high actual capacity of 82.26%, it minimizes deviation from the stated capacity. With 10,000mAh, it can fully charge a smartphone about twice.

Its compact design—2.0cm thick and 80.68cm² surface area—is ideal for commuting or school. Supports fast charging at 35W and efficient device charging with an input of 30W.

MagSafe-compatible & Wireless Charging: Zolo Power Bank (10,000mAh, 30W, MagGo) (Anker)

Score: 4.52 / Cheapest Price: ¥5,990

A wireless charging-enabled mobile battery. Compatible with MagSafe, it can magnetically attach to iPhones for convenient charging.

It maintains a high actual capacity of 86.69%, with minimal deviation from the nominal value. The maximum wired charging output is 33W, and wireless charging provides 7.5W. For faster charging, using a cable is recommended.

Made with silicone, it’s designed to prevent damage to devices during charging. Its portability is excellent, and it’s unobtrusive when carried with a smartphone.

Top 5 Advanced Feature-Rich Products

Fast-charging powerhouse: Mobile Battery EC-C44LBK (Elecom)

Score: 4.51 / Cheapest Price: ¥6,999

Equipped with two Type-C ports and one Type-A port. You can check remaining battery percentage numerically, compatible with a wide range of devices from smartphones to laptops.

Actual capacity is 78.20%, with minimal deviation from the listed value. It delivers a maximum of 67W, enabling rapid charging for smartphones and laptops. The device itself can be recharged quickly with an input of 67W, making it suitable for quick top-ups even if you forget to charge it overnight.

Compact at 3.1cm thick and 78.00cm² surface area, easy to carry in bags or pockets.

Multi-function model with AC plug: SMARTCOBY Ex03 SLIM PLUG ＆ CABLE (CIO)

Score: 4.48 / Cheapest Price: ¥5,780

A 3-in-1 design with both a USB Type-C cable and a foldable AC plug built-in. Supports pass-through charging for simultaneously charging the battery and connected devices.

Actual capacity is 82.28%, with minimal deviation from the stated value, ensuring the expected number of charges. Slim profile at 2.2cm thick and 73.21cm² surface area makes it ideal for travel or business trips.

Features rapid charging with a maximum output of 36W and quick recharging of the device itself. Also functions as an AC charger, allowing charging directly from outlets.

Accelerated wireless charging: MagFlow PB773 (UGREEN)

Score: 4.48 / Cheapest Price: ¥6,825

A Qi2 standard wireless charging mobile battery. Built-in Type-C cable, supporting both wired and wireless charging.

Supports 36W wired output and 25W wireless output via Qi2, enhancing convenience for smartphone charging. Maintains an actual capacity of 73.66%, enabling multiple charges for smartphones per full recharge.

Compact at 2.1cm thick and 77.87cm² surface area, easy to carry. An excellent choice for those seeking both high performance and portability.

3-in-1 with full features: Power Bank (10,000mAh, Fusion, Built-In USB-C Cable) (Anker)

Score: 4.47 / Cheapest Price: ¥7,990

All-in-one design with USB Type-C cable and AC adapter. Simply plug into an outlet to fully charge the device.

Maintains a high actual capacity of 83.73%, suitable for long trips. Supports rapid charging at 35W, and its compact size (3.1cm thick, 55.34cm²) makes it easy to store in bags or pouches.

Combines multiple functions in one device, reducing the need for extra equipment.

High power & compactness: Prime Power Bank (9600mAh, 65W, Fusion) (Anker)

Score: 4.46 / Cheapest Price: ¥14,990

A hybrid model combining a USB charger and a mobile battery. Features a foldable plug that allows it to function as a standalone charger.

Actual capacity is 81.31%, with minimal deviation from the nominal. Maximum output of 67W enables quick charging of smartphones and tablets. Thickness is 4.3cm, but it’s compact with a surface area of 49.81cm², fitting easily into bags or pouches for portability.

Ideal for those seeking both fast charging and portability.

Tips for Choosing a Mobile Battery Manufacturer Product

Pay attention to the discrepancy between actual capacity and listed capacity to avoid mistakes. The evaluation results show that many high-rated products maintain actual capacity at over 75% of the nominal value.

Also, balancing fast charging performance with device charging speed is crucial. Even if the maximum output for charging your smartphone is high, slow device charging can limit usability before heading out. Choosing a product that excels in both areas ensures more practical operation.

Portability is another key point. Thickness around 1.8–2.0cm allows the device to fit comfortably in pockets or bags, making daily carrying feasible.

Select the mobile battery that best fits your usage scenario and priorities.