Mobile Battery Comparison Guide: Choose the Best One Based on Features and Price

If you’re out and about and need to charge your smartphone or tablet, a portable battery is an essential item. Available from numerous manufacturers such as Anker, CIO, UGREEN, and more, with capacities and charging speeds varying widely. So, which product should you choose to avoid mistakes? This time, we compare 49 popular products on the market through actual measurements and introduce truly excellent mobile batteries.

5 Key Points for Comparing Mobile Batteries

To improve the accuracy of product selection, we conducted detailed tests on the following items.

• Actual Capacity Fulfillment Rate: The percentage of usable power relative to the labeled capacity
• Portability: Ease of carrying judged by thickness and surface area
• Smartphone Charging Speed: Actual charging time measured at maximum output
• Device Charging Speed: Charging completion time based on maximum input
• Wireless Charging Support: Convenience of not needing a separate cable

For Fast Charging Enthusiasts: Choose by Output Value

High-output models over 67W

ELECOM’s “Mobile Battery EC-C44LBK” and “SMARTCOBY TRIO” secure over 67W of actual output. They can charge multiple devices simultaneously, including laptops, making them ideal companions for business trips or long travels. Especially, ELECOM’s model has an actual capacity of 78.20%, offering high reliability and can charge smartphones quickly, suitable for those with short morning prep times.

Standard range of 35–40W

CIO’s “SMARTCOBY Pro SLIM CABLE” has an actual output of 39W, providing sufficient performance for daily use. It features an internal cable, eliminating the hassle of purchasing separately, and has an excellent actual capacity of 75.98%. Similarly, CIO’s “SMARTCOBY Pro SLIM” supports 38W, with a thickness of only 16mm, making it suitable for those who carry it in their pocket.

For Compactness Seekers: Choose by Size

Ultra-thin models under 2cm thick

The 1.6cm thickness of “SMARTCOBY Pro SLIM” is among the thinnest in the industry. It can be stacked with a smartphone without discomfort and fits easily into bag gaps. Its surface area is just 63.77cm², making it smart and lightweight enough to carry daily in your commuting bag.

Small and lightweight with 50–60cm² surface area

Anker’s “Prime Power Bank” is extremely compact at 49.81cm². It features a foldable plug, functioning as a charger, making it perfect for reducing luggage during travel. Its actual capacity remains reliable at 81.31%.

Wireless Charging Support: Choose by Wireless Charging

Anker’s “Zolo Power Bank” ensures a high actual capacity of 86.69% and supports MagSafe, allowing iPhones to be magnetically fixed. However, wireless charging is only 7.5W, which is slow; for urgent charging, using a cable (actual measurement 33W) is recommended.

Meanwhile, UGREEN’s “MagFlow” supports Qi2 standard with 25W wireless charging. The speed difference compared to wired charging (36W actual measurement) is minimal, providing stress-free use. With an actual capacity of 73.66%, it offers sufficient power storage and is a balanced choice.

Choose by Built-in Cable: For Those Who Want to Reduce Luggage

Products from CIO and Anker feature built-in USB Type-C cables. This eliminates the hassle of purchasing or carrying separate cables. Notably, CIO’s “SMARTCOBY Pro SLIM CABLE” and “Ex03 SLIM PLUG ＆ CABLE” include foldable AC plugs, minimizing the number of chargers needed during business trips—ideal for minimalists.

For Large Capacity: For Those Who Need Multiple Charges

CIO’s “SMARTCOBY TRIO” has 20,000mAh, which is roughly twice the capacity of 10,000mAh models. It supports three ports simultaneously, allowing charging of smartphones, tablets, and earphones at the same time. Its actual capacity of 75.23% closely matches the labeled capacity, ensuring reliable expected charging cycles.

Actual Measurement Data: Points to Consider When Comparing Mobile Batteries

Why Actual Capacity Varies Significantly

Even with a labeled 20,000mAh, some products have an actual capacity below 70%, while others exceed 85%. This depends on internal circuit efficiency and battery cell quality. Reputable manufacturers generally ensure over 75%, with many of CIO and Anker’s higher-end models exceeding 80%.

Charging Speed Depends on Usage

About 35W is sufficient for daily smartphone charging. Over 67W is aimed at users who need rapid charging for multiple devices, including laptops and tablets. If you charge at home via outlet afterward, there’s no need to choose a high-output product.

Recommended Mobile Battery Rankings

Final Tips for Choosing a Mobile Battery

Prioritize Compactness: SMARTCOBY Pro SLIM (CIO)
Prioritize Fast Charging: SMARTCOBY TRIO (CIO) or ELECOM’s EC-C44LBK
Want a Balanced Option: SMARTCOBY Pro SLIM CABLE (CIO)
Interested in Wireless Charging: MagFlow PB773 (UGREEN)
Value Multi-functionality: Ex03 SLIM PLUG ＆ CABLE (CIO)

While popular products from each manufacturer on the market do not differ significantly in basic performance, choosing one that matches your lifestyle is key to long-term use. If you carry it every day, prioritize thickness; for occasional business trips, focus on capacity. Set your priorities accordingly and select the best fit.