Brother Electronics
Fast Charging Power Bank S39
Fast Charging Power Bank S39
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Core Features & Technology
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High Battery Capacity: The S39 typically comes in a 50,000mAh or 30,000mAh configuration, making it a "heavy-duty" power station capable of charging a standard smartphone 6 to 10 times.
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22.5W / 20W PD Fast Charging: Supports Power Delivery (PD) and Quick Charge (QC 3.0) protocols. It can charge compatible iPhones and Android devices up to 50% in roughly 30 minutes.
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Multi-Device Charging: Equipped with 3 to 4 output ports (usually 2 USB-A and 1 or 2 USB-C), allowing you to charge a phone, tablet, and earbuds simultaneously.
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Digital Battery Display: Unlike simple LED dots, the S39 features a clear LED numeric display that shows the exact percentage of power remaining.
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Emergency LED Flashlight: Includes a built-in high-brightness LED light, which is useful for camping or during power outages.
Technical Specifications
| Feature | Details |
| Model | S39 / B39 (variants exist under brands like Hoco or generic lots) |
| Capacity | 50,000mAh (most common) / 30,000mAh |
| Input Ports | Micro-USB and Type-C (Bi-directional) |
| Output Ports | 2x USB-A (QC 3.0), 1x Type-C (PD) |
| Safety Systems | Over-charge, over-voltage, and short-circuit protection |
| Build Material | Fireproof ABS + PC shell |
Best For:
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Frequent Travelers: Ideal for long trips where you won't have access to a wall outlet for several days.
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Power Outages: A reliable backup for home use to keep multiple family members' phones charged.
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Outdoor Activities: Great for camping or hiking due to the built-in flashlight and massive capacity.
Note: Because of its large capacity (above 27,000mAh / 100Wh), this power bank is usually not allowed in airplane carry-on luggage without special airline permission. Always check your airline's Wh (Watt-hour) limits before traveling.
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