1. Introduction
This manual provides essential information for the safe and effective use of your Diwiter M18 18V Li-ion Power Tool Battery. This battery is designed to be compatible with a wide range of Milwaukee M18 series power tools, offering stable output, strong endurance, and improved work efficiency. Please read this manual thoroughly before first use and keep it for future reference.
For a comprehensive guide, you may also refer to the official user manual PDF: Diwiter M18 Battery User Manual (PDF).

Figure 1: Diwiter 18V 12.0Ah Li-ion Power Tool Batteries
2. Safety Warnings
⚠ WARNING: Please mind potential fire risk and strictly follow the instruction manual for charging and storage. For disposal, please check your local authority's website for more information and dispose of the lithium-ion battery safely in accordance with the applicable legal requirements.
- Do not disassemble or modify the battery.
- Avoid exposure to high temperatures or open flames.
- Do not immerse the battery in water.
- Keep out of reach of children.
- Do not short-circuit the battery terminals.
- Use only with specified chargers.

Figure 2: Battery features multiple protection mechanisms including short-circuit, overvoltage, overcurrent, overheat, and overdischarge protection.
3. Setup
3.1 Charging the Battery
- Verify compatibility between your power tool charger and the Diwiter battery before attempting to charge.
- Align the battery with the charger's connector.
- Gently push the battery into the charger until it is securely seated and clicks into place.
- Follow the charger's instructions for charging duration and indicators.
- Charge the battery promptly after use to prevent complete discharge, which can extend battery life.
3.2 Installing the Battery into a Tool
- Ensure the power tool is turned off before installing or removing the battery.
- Align the battery with the tool's battery slot.
- Gently push the battery into the tool until it is securely seated and clicks into place.
- To remove, press the battery release button (if present on the tool) and slide the battery out.

Figure 3: Snap-fit compact design for easy installation and removal, with an exquisite and durable interface.
4. Operating Instructions
Once the battery is fully charged and securely installed in your compatible Milwaukee M18 power tool, the tool is ready for operation according to its own user manual. The Diwiter battery provides stable and consistent power output for optimal tool performance.

Figure 4: Diwiter battery powering various Milwaukee M18 tools in typical usage scenarios.
Video 1: Product overview showcasing features, compatibility, and applications of the Diwiter M18 battery.
5. Maintenance
5.1 Storage
- Store the battery in a cool, dry location away from direct sunlight.
- Avoid prolonged exposure to high-temperature environments.
- Do not store together with metal objects (e.g., keys, coins, jewelry) to prevent short-circuiting.
- For long-term storage, it is recommended to store the battery at approximately 50% charge.
5.2 Cleaning
- Clean the battery terminals and casing with a dry, soft cloth.
- Do not use water or any cleaning solvents that could damage the battery.
6. Troubleshooting
6.1 Frequently Asked Questions (FAQs)
- Battery does not charge: Check whether the charger and battery connector are functioning properly. Ensure the battery is fully seated in the charger.
- Battery becomes hot during use or charging: Discontinue use or charging immediately. Allow the battery to cool down. If the issue persists, contact customer support.
- Abnormal battery level indication: Try restarting the device (tool) or removing and reinserting the battery. If the problem continues, the battery may need replacement.
7. Specifications
| Feature | Specification |
|---|---|
| Brand Name | Diwiter |
| Compatibility | Milwaukee M18 Series Power Tools |
| Nominal Capacity | Available in 3.0Ah, 6.0Ah, 12.0Ah |
| Rated Voltage | 18V (also compatible with 12V tools depending on specific battery variant) |
| Battery Type | Li-Ion |
| Cell Type | 18650 |
| Color | Black |
| Origin | Mainland China |
7.1 Compatible OEM Part Numbers
- 48-11-1811, 48-11-1815, 48-11-1820, 48-11-1822, 48-11-1828, 48-11-1840, 48-11-1841, 48-11-1850, 48-11-1860, 48-11-1890, 48-11-1852
- 48-59-181, 48-59-1850
- 4932352071, 4932430063
- C18B, Li18, M18, M18B, M18B2, M18B4, M18B5, M18BX

Figure 5: The battery is compatible with a wide array of Milwaukee M18 electric tools.
8. User Tips
- Always ensure the battery is fully charged before starting a significant task to maximize runtime.
- Keep spare batteries charged and ready for extended work sessions.
- Regularly inspect battery terminals for dirt or damage and clean as necessary.
- Avoid completely draining the battery before recharging; partial charges are generally better for Li-ion battery longevity.
9. Warranty and Support
For warranty information, technical support, or service inquiries, please contact the seller or manufacturer directly. Keep your purchase receipt as proof of purchase.