Hello Big Green.
Thank you for your feedback. We are glad to hear you are enjoying the performance, cut quality, and quieter operation of the 80V 21" Self-Propelled Lawn Mower (LM2138S). We understand your concern about long-term battery performance, as runtime and battery lifespan are important factors for overall satisfaction. Battery longevity can vary depending on usage conditions such as grass thickness, cutting height, and terrain, but maintaining best practices, like avoiding full depletion, storing the battery in a cool, dry place, and charging it after each use, can help extend its overall life. For optimal runtime, mowing regularly and not removing more than one-third of the grass blade at a time can also reduce strain on the battery. You may also find it helpful to review official Greenworks instructional videos on the Greenworks Tools YouTube channel for battery care and mower operation tips, including this video on tips for storing your Greenworks battery (https://www.youtube.com/shorts/q-ITYPs3yBo?feature=share). If you notice any significant decline in performance over time, we recommend reaching out to Greenworks success team so they can review your battery and provide assistance if needed. They can be reached either using the online chat function, on Greenworks Tools page, or by calling 1-888-909-6757.

Thank you for your feedback on the 80V 21" Self-Propelled Mower (SKU 2550402 / MO80L416). Based on your description, it sounds like the conditions, heavy overgrowth, uneven terrain, and thick weeds, were beyond what a single-pass cut is typically designed to handle, which can lead to higher battery draw and reduced self-propel performance. For best results in these environments, we recommend first clearing the area to reduce overall vegetation height, then mowing in stages rather than attempting a full cut in one pass, starting at a higher deck setting and gradually lowering it on subsequent passes to avoid overloading the blade and drive system. Slowing your forward pace and ensuring the underside of the deck is clear of built-up debris can also help improve airflow and cutting efficiency, especially in dense growth. In very rough or uneven lots, breaking the area into smaller sections and avoiding wet or matted weeds will further reduce strain on the battery. For additional guidance, Greenworks Tools also offers an official instructional video on mowing overgrown grass conditions, which demonstrates best practices for tackling challenging terrain and maximizing runtime. We hope you will find this information helpful. If you require any additional support or have questions regarding a product, we recommend trying our Q&A section on products' page or Chat with us direct on our website or call 1-888-909-6757. We are here to help.