1. Product Overview
The DayPlus 21V Cordless Electric Chainsaw is a versatile and portable tool designed for efficient wood cutting, tree pruning, and various gardening tasks. It features a powerful brushless motor, a high-capacity rechargeable lithium-ion battery, and multiple safety mechanisms to ensure reliable and safe operation.

Package Contents
The standard package includes:
- 1 x Chainsaw Machine (4-inch, 6-inch, or 12-inch model as selected)
- 1 x Chain (or 2 chains for some packages)
- 1 x Battery (or 2 batteries for some packages)
- 1 x Charger
- 1 x Wrench
- 1 x Screwdriver
- 1 x User Manual
- 1 x Oil Pot (for lubrication)
- 1 x Pair of Non-slip Gloves
- 1 x Pair of Safety Glasses
- 1 x Equipment Box (for 6-inch model)

2. Setup and Assembly
The DayPlus Cordless Electric Chainsaw is designed for quick and easy setup. Most components come pre-installed.
- Unpack Components: Carefully remove all items from the packaging and verify against the package contents list.
- Battery Installation: Ensure the battery is fully charged before first use. Insert the charged battery into the chainsaw handle until it clicks securely into place.
- Chain Tension Adjustment: The chainsaw comes with the chain pre-installed. Use the provided wrench to adjust the tightness of the chain. The chain should be snug but still able to move freely around the guide bar. Once adjusted, tighten the screw firmly.
- Lubrication (if applicable): For models with manual lubrication, fill the oil pot with appropriate chain lubricant. For models with an automatic oiling system, ensure the oil reservoir is filled.
- Safety Gear: Always wear the provided safety glasses and gloves before operating the chainsaw.


3. Operating Instructions
The DayPlus chainsaw is designed for high-efficiency cutting of wood, branches, and for general gardening and logging tasks.
- Safety First: Always wear appropriate personal protective equipment, including safety glasses, gloves, and hearing protection. Ensure the work area is clear of obstructions and bystanders.
- Starting the Chainsaw: Engage the safety lock (if present) and then press the power trigger to start the chainsaw. The self-locking speed switch prevents accidental activation.
- Cutting Technique: Hold the chainsaw firmly with both hands (if applicable for larger models) or one hand (for mini models with ergonomic design). Position the chain against the material to be cut and apply steady, even pressure. Allow the chainsaw to do the work; do not force it.
- Overload Protection: The lithium-ion battery features overload and over-temperature protection. If the chainsaw stops working due to overload, disconnect the battery from the power plug and reinsert it to restart the unit.
- Automatic Oiling System (12-inch model): The 12-inch model features an automatic oiling system with an oil level indicator window. Ensure the reservoir is filled with chain lubricant for continuous and stable oil supply, which ensures smooth and effective cutting.



4. Maintenance
Regular maintenance ensures the longevity and optimal performance of your DayPlus chainsaw.
- Chain Lubrication: For models with a button pump lubrication system, press the fuel injection button periodically to lubricate the chain. For automatic oiling systems, regularly check the oil level indicator and refill as needed. Proper lubrication increases the life of the guide plate and chain.
- Chain Inspection: Regularly inspect the chain for sharpness and wear. A dull chain can reduce cutting efficiency and increase strain on the motor. Replace worn or damaged chains promptly. The high hardness wear-resistant chain is designed for durability.
- Battery Care: Charge the battery fully after each use. Store batteries in a cool, dry place. Lithium-ion batteries with overload and over-temperature protection help extend battery life.
- Cleaning: After each use, clean the chainsaw body and guide bar to remove wood chips, dust, and debris. Ensure the adjustable chain baffle is clear of obstructions.


5. Troubleshooting
- Chainsaw stops working: If the chainsaw stops unexpectedly, it may be due to the battery's overload or over-temperature protection. Disconnect the battery from the power plug, wait a few moments, and then reinsert the battery to restart the unit.
- Reduced cutting efficiency: Check the chain tension and ensure it is properly lubricated. A dull chain will also reduce efficiency; consider sharpening or replacing the chain.
- Excessive vibration: Ensure the chain is correctly installed and tensioned. Check for any loose components.
6. Specifications
| Feature | 4-inch Model (Example) | 6-inch Model (Example) | 12-inch Model (Example) |
|---|---|---|---|
| Brand Name | DayPlus | ||
| Power Type | Battery (Rechargeable Lithium-ion) | ||
| Motor Type | Brushless Motor (Pure Copper) | ||
| Rated Power | 550 W | 600 W | Not specified (High Power) |
| Rated Voltage | 220 V | 21 V | 21 V |
| No-load Stroke | 2000 SPM | 2200 RPM | 21000 RPM |
| Chain Speed | 5300 U/min | 5300 U/min | 13 m/s |
| Guide Plate Length | 4 inches | 6 inches | 12 inches |
| Body Weight | 0.8 KG | 1.2 KG | Not specified |
| Body + Battery Weight | 1.1 KG | Not specified | Not specified |
| Battery Capacity | 21V 1.5Ah (2000mAh) | 21V 1.5Ah (1500mAh) | 4000mAh |
| Cutting Diameter | 0 – 60 mm | 0 – 80 mm | Up to 28.5 cm (11.2 inches) |
| Charging Time | 1.5 hours | Not specified | Approx. 60 minutes |
| Operating Time | 65 minutes (approx.) | 60-90 minutes | 45 pieces of 10cm firewood (per charge) |
| Certification | CE | ||
| Feature | Anti-Slip, Safety Lock, Overload/Over-temperature Protection | ||



7. Warranty and Support
DayPlus offers a lifetime additional long-term warranty with FREE lifetime technical support from experts. For any issues or technical assistance, please refer to the contact information provided with your purchase or on the official DayPlus website.
8. User Tips
- Ergonomic Design: The chainsaw features a lightweight and portable design with a non-slip, ergonomic handle, making it comfortable for extended use and easy to maneuver.
- One-Handed Operation: The mini chainsaw models are designed for convenient one-handed operation, ideal for quick pruning tasks.
- Versatile Use: Suitable for a wide range of applications, from household outdoor logging to agricultural horticulture and trimming tall branches.