Hello YOdin.

There are several factors can influence the actual runtime of your battery when using a string trimmer:

Trimmer Line Thickness: Thicker lines (e.g., 0.105") require more power to spin than thinner ones (e.g., 0.080"), which can significantly reduce battery life. We recommend using the trimmer line size specified in the user manual for optimal performance and efficiency.

Power Level Settings: Running the trimmer at higher speed or power settings uses more energy and shortens runtime.

Workload and Conditions: Trimming dense, tall, or overgrown vegetation puts a greater load on the motor, leading to faster battery drain.

Trimming Technique: Operating at full throttle continuously will deplete the battery quickly. Using a lighter touch or “feathering” the trigger can help extend runtime (as noted by Pro Tool Reviews).

Battery Age and Health: Lithium-ion batteries degrade over time, which naturally results in shorter runtimes as the battery ages.

If you’re consistently running out of battery before completing your work, consider keeping a backup battery on hand or adjusting your trimming habits to help maximize efficiency.

If you’d like us to look into your current runtime further, please don’t hesitate to start a Live Chat at www.greenworkstools.com or call us at 1-888-909-6757. We're here to help!

Hello Willie F.

Thank you for sharing your concerns with us. Please note that the batteries will need time to cool down before charging. The cooling time may vary depending on how much heat was generated during use. The recommended battery storage temperature range 32°F (0°C) - 113°F (45°C). Battery discharging temperature range 32°F (0°C) - 113°F (45°C). This information can also be found in the user manual. Outdoor temperatures can also impact battery performance. Using the unit in extreme heat can cause the battery to overheat and drain more quickly. Store the unit cold, keep in the shade when possible, during use. This will help maximize runtime before overheating in hot environments. We hope you will find this information useful. Should you require further assistance, please feel free to reach out to us via Live Chat on our website at www.greenworkstools.com, or by calling us directly at 1-888-909-6757.