1. Introduction
Thank you for choosing the charmast 10000mAh Portable Charger, Model CM15. This device is designed to provide convenient and efficient power for your mobile devices on the go. Featuring built-in charging cables and an integrated wall plug, it offers a versatile charging solution without the need for additional accessories. Please read this manual carefully before using the product to ensure safe and optimal performance.
2. Safety Information
To prevent injury, damage to the product, or property damage, please observe the following safety precautions:
- Do not expose the power bank to extreme temperatures (above 60°C/140°F) or direct sunlight.
- Do not expose the power bank to water, moisture, or flammable liquids.
- Do not disassemble, modify, or attempt to repair the device. This will void the warranty.
- Keep the power bank away from children.
- Do not drop, puncture, or apply excessive force to the power bank.
- Use only compatible charging cables and adapters.
- If the power bank swells, emits an odor, or becomes hot during charging or use, discontinue use immediately and contact customer support.
- Dispose of the power bank according to local regulations for electronic waste.
3. Package Contents
Verify that all items are present in your package:
- charmast 10000mAh Portable Charger (Model CM15) x 1
- User Manual x 1
4. Product Features
- 10000mAh High Capacity: Provides multiple charges for smartphones and other devices.
- Built-in Cables: Includes integrated USB-C and Lightning cables for broad compatibility.
- Integrated Wall Plug: Allows direct charging from an AC outlet without an external adapter.
- USB-C Input/Output Port: Offers additional flexibility for charging devices or recharging the power bank.
- Smart Digital LED Display: Clearly shows the remaining battery percentage.
- Compact and Durable Design: Weighs approximately 12.99 ounces (368 grams) with a rubberized, 3D-textured surface for enhanced grip and protection.
- Fast Charging: Supports 15W output for efficient device charging.
- Auto Shut-Off: Automatically powers off when not in use or when charging is complete to conserve energy.
5. Setup and Charging the Power Bank
5.1 Initial Charge
It is recommended to fully charge your charmast portable charger before its first use to optimize battery performance and lifespan.
5.2 Recharging the Power Bank
You have two options to recharge your power bank:
- Using the Built-in Wall Plug:
- Fold out the integrated AC wall plug.
- Plug the power bank directly into a standard AC wall outlet.
- The LED display will show the charging progress, indicating 100% when fully charged.
- Using the USB-C Input Port:
- Connect a USB-C charging cable (not included) to the power bank's USB-C port.
- Connect the other end of the cable to a compatible USB wall adapter (not included).
- The LED display will show the charging progress.

Image: The charmast 10000mAh Portable Charger showing its built-in cables, USB-C port, and integrated wall plug.
6. Operating the Power Bank (Charging Your Devices)
The charmast portable charger can charge up to three devices simultaneously using its built-in cables and USB-C output port.
6.1 Charging with Built-in Cables
- Identify the appropriate built-in cable for your device (USB-C or Lightning).
- Gently pull out the desired cable from its storage slot.
- Connect the cable to your device's charging port.
- The power bank will automatically begin charging your device. The LED display will show the remaining battery percentage.
- Once charging is complete, disconnect the cable from your device and carefully return the cable to its storage slot.
6.2 Charging with the USB-C Output Port
- Connect your device's charging cable (e.g., USB-C to USB-C) to the power bank's USB-C port.
- Connect the other end of the cable to your device.
- The power bank will automatically begin charging.
6.3 Checking Battery Level
The digital LED display on the power bank shows the current battery percentage. This allows you to monitor the remaining power at a glance.
7. Maintenance
- Cleaning: Use a soft, dry cloth to clean the surface of the power bank. Do not use harsh chemicals or abrasive materials.
- Storage: Store the power bank in a cool, dry place away from direct sunlight and extreme temperatures. If storing for an extended period, charge the power bank to approximately 50-75% every 3 months to maintain battery health.
- Avoid Drops: While designed to be durable, avoid dropping the power bank to prevent internal damage.
8. Troubleshooting
- Power bank not charging:
- Ensure the wall plug is fully inserted into a working AC outlet.
- If using the USB-C input, ensure the cable and wall adapter are functional and properly connected.
- Device not charging from power bank:
- Ensure the built-in cable or external USB-C cable is securely connected to both the power bank and your device.
- Check if the power bank has sufficient charge (refer to the LED display).
- Try a different cable or port if available.
- Some devices may require a specific charging protocol; ensure compatibility.
- LED display not working:
- The display should activate when charging or when a device is connected. If it remains off, the power bank might be fully discharged or require service.
- Slow charging:
- Ensure your device supports 15W fast charging.
- Check the cable for damage.
- Charging multiple devices simultaneously may reduce individual charging speeds.
9. Specifications
| Model Name | CM15 |
| Battery Capacity | 10000mAh |
| Battery Cell Type | Lithium Polymer |
| Input (Wall Plug) | AC 100-240V, 50/60Hz (Typical) |
| Input (USB-C) | 5V/3A (15W Max) |
| Output (Built-in Cables / USB-C Port) | 5V/3A (15W Max total) |
| Special Features | Auto Shut-Off, Built-in Cables (USB-C, Lightning), Built-in Wall Plug, Fast Charging, LED Indicator Lights |
| Dimensions (L x W x Th) | 2.76" x 5.95" x 0.72" (70mm x 151mm x 18.3mm) |
| Weight | Approx. 12.99 ounces (368 grams) |
| Color | Black |
| Compatible Devices | iPhone 15/16 Series, Samsung Galaxy S25, Google Pixel 10, iPad, and other USB-C/Lightning compatible devices. |
10. Warranty and Support
Your charmast 10000mAh Portable Charger (CM15) comes with a 24-month warranty from the date of purchase. This warranty covers manufacturing defects and ensures reliable performance of your device.
For any questions, issues, or warranty claims, please contact our customer service team. We offer friendly 7-day/24-hour customer service and aim to resolve any problems within 24 hours.
Contact Information: Please refer to the contact details provided on the product packaging or the official charmast website for the most up-to-date support channels.







