Introduction
This manual provides essential information for the safe and effective use of your ELECOM Portable Charger Power Bank 10000mAh. Please read it thoroughly before operation.
Product Overview
Product Features
- 20W USB-C PORTABLE CHARGER - 10000MAH BATTERY BANK: Fully compatible with all USB-C and USB-A powered devices including phones, laptops, tablets, cameras and more. It is equipped with a safety-designed rechargeable lithium-ion battery that can be used repeatedly about 500 times. The slim designed body with rounded corners that fit in your hand well, weight only 8.2oz, no problem carrying in your pocket.
- DUAL USB CHARGING: The 20W USB-C port and 18W USB-A port can provide high-speed charging for 2 devices at the same time. The intelligent controlling (IC) automatically identifies the connected device and distributes required power to each device for optimized charging.
- WIDER COMPATIBILITY - CHARGING LOW-CURRENT ACCESSORIES: Most power banks are incapable of charging low-current accessories, however ELECOM Portable Charger can work with not only all the phones & tablets, but also your smaller devices like AirPods, Bluetooth headphones, fitness trackers, smart watches, etc.
- EASY TO READ THE LED INDICATOR: The LED indicator displays the available power level of battery pack and charging status, no more guessing whether need to charge it or not. Lets you know before you go!
Package Contents
- ELECOM 20W Portable Charger
- USB Type-C cable (0.1m/3.9inch)
Product Dimensions and Weight
- Dimensions: 2.8 x 0.5 x 5.5 inches (73 x 15 x 141mm)
- Weight: 8.2oz (233g)
Product Image

This image shows the ELECOM Portable Charger Power Bank, a sleek black device with USB-C and USB-A ports visible on one end. The ELECOM logo is subtly embossed on the surface.
Setup
Initial Charging of the Power Bank
Before first use, fully charge the power bank.
- Connect the supplied USB Type-C cable to the USB Type-C port on the power bank.
- Connect the other end of the USB Type-C cable to a compatible AC charger (not included).
- Plug the AC charger into a wall outlet. The LED indicators on the power bank will illuminate to show charging progress.

This image illustrates the power bank connected to a wall charger via a USB-C cable, indicating the charging process.
Operating Instructions
The power bank features both USB-C and USB-A ports for versatile charging.
Single Device Charging
- Connect your device to either the USB-C port (for USB-C compatible devices) or the USB-A port (for USB-A compatible devices) using an appropriate charging cable.
- Charging will begin automatically. If charging does not start, briefly press the power button on the power bank.

This image shows the power bank connected to a smartphone via a charging cable, demonstrating single device charging.
Dual Device Charging
The power bank can charge two devices simultaneously using both the USB-C and USB-A ports.
- Connect the first device to the USB-C port.
- Connect the second device to the USB-A port.
- The intelligent controlling (IC) will automatically detect the connected devices and distribute power for optimized charging.

This image displays the power bank simultaneously charging a tablet and a smartphone, highlighting its dual charging capability.
Charging Low-Current Accessories
This power bank supports charging low-current devices such as Bluetooth headphones, fitness trackers, and smartwatches.
- Connect the low-current accessory to the USB-A port.
- Press and hold the power button for approximately 3 seconds to activate low-current charging mode. The LED indicators will change to confirm the mode is active.

This image shows the power bank connected to a pair of wireless earbuds, demonstrating its ability to charge low-current accessories.
Checking Battery Level
The LED indicators on the power bank display the remaining battery charge.
- Four LEDs: 75-100%
- Three LEDs: 50-75%
- Two LEDs: 25-50%
- One LED: 0-25% (Recharge soon)

This image highlights the LED indicators on the power bank, which show the remaining battery charge.
Maintenance
Battery Care
The power bank is equipped with a safety-designed rechargeable lithium-ion battery that can be used repeatedly about 500 times.
- Avoid extreme temperatures (hot or cold) as they can degrade battery performance and lifespan.
- Store the power bank in a cool, dry place when not in use.
- Do not fully discharge the battery for extended periods. Recharge it periodically if stored for a long time.
Cleaning
Use a soft, dry cloth to clean the exterior of the power bank. Do not use harsh chemicals or abrasive materials.
Troubleshooting
Common Issues
Device Not Charging
- Ensure the power bank is sufficiently charged. Check the LED indicators.
- Verify that the charging cable is securely connected to both the power bank and your device.
- Try a different charging cable or device to rule out cable or device issues.
- Briefly press the power button on the power bank to initiate charging.
Instructions in Foreign Language
The included paper manual may contain sections in languages other than English. Refer to the visual diagrams for guidance on basic operation. For detailed English instructions, please consult the official ELECOM website or the provided PDF user manual link.
Specifications
Technical Specifications
| Feature | Detail |
|---|---|
| Brand | ELECOM |
| Model Number | EC-C03BK |
| Battery Capacity | 10000mAh |
| USB-C Output | 20W Power Delivery |
| USB-A Output | 18W |
| Connector Type | USB Type A, USB Type C |
| Product Dimensions | 0.59 x 2.87 x 5.55 inches |
| Item Weight | 8.2 ounces |
| Color | Black |
Safety Precautions
Observe these precautions carefully to avoid personal injury, damage, fire, and other problems.
DANGER
- Use only adapters and connection cables specified by ELECOM and be sure to observe the charging conditions specified by ELECOM.
- Use of another type of adapter or charging under other conditions can cause the rechargeable battery to overheat, leak fluids, or explode.
- Do not disassemble or modify this product. Doing so may cause fire, electric shock, or other problems.
- Do not use a rechargeable battery that has leaked fluid. Doing so can cause heat generation and damage.
- Do not allow this product to become shorted. Do not allow the positive and negative terminals of this product to become connected by metal. Do not carry or store this product together with necklaces, hair pins, coins, keys, etc. Metal objects such as these can cause dangerous shorting, the flow of excessive current, heat generation, explosion, and fire, and can generate heat in the metal items.
- If you notice a problem with this product, stop using it.
- If you notice leaking, a change in color or shape, or anything else that is different than before, stop using this product. Continued use may generate heat or cause a rupture.
- If fluid leaking from this product gets on your body or clothes, wash it off with clean water. If the fluid in the internal battery gets on your skin or clothes, there is a risk of skin damage.
- If the fluid in the internal battery gets in your eyes, there is a risk of a loss of eyesight. Wash your eyes completely with clean water without rubbing them and immediately seek medical attention.
- Do not attach or detach this product while your hands are wet. Doing so can cause electric shock and personal injury.
- Unplug the power plug from the power outlet before performing any user maintenance. Failure to do so can cause electric shock or personal injury.
- Use only the specified voltage. Use of voltage outside the specified range can cause damage to the product.
Additional Precautions
- This product may generate heat when charging. Always charge in a well-ventilated area. Do not charge under direct sunlight, or near heat sources.
- Keep this product away from heat sources, direct sunlight, combustible gas, humidity, water or other liquids.
- Do not insert foreign objects into this product.
- Do not subject this product to mechanical shock such as dropping or crushing.
- Do not short-circuit this product or store it in a receptacle where it may be short-circuited by other metallic or conducting objects.
- The product usage by children should be supervised.
- Use of the product is subject to the local ordinances and laws of your area.

This image illustrates the various safety protections built into the power bank, including overcharging, over-discharge, overvoltage, overcurrent, and short circuit protection.
Warranty and Support
Product Support
For further assistance or warranty information, please visit the official ELECOM brand store or contact customer support.
Visit the ELECOM Store on Amazon
Disposal of Old Electrical & Electronic Equipment
When you no longer need to use this product and the battery, be sure to dispose of it in accordance with the local ordinances and laws of your area.

This image shows the crossed-out wheeled bin symbol, indicating that the product should not be disposed of with household waste.





