Hello RI82.
We appreciate you sharing your experience. It is good to hear the mower itself is performing well, though we understand the frustration with the runtime of the 60V 4.0Ah battery in thicker, faster-growing grass. Battery performance can vary quite a bit depending on conditions, dense or damp grass, cutting height, and pace all impact power draw. For best results, mowing more frequently, raising the deck height slightly for the first pass, and avoiding peak moisture conditions can help extend runtime. For properties around a quarter acre with heavier growth, many users find that a higher-capacity battery or having a second battery available provides a more consistent experience without needing to rush or double back. If your battery seems to be depleting faster than expected under normal conditions, we recommend reaching out to Greenworks success team to ensure it is performing within specifications and to review available options. They can be reached either using the online chat function, on Greenworks Tools page, or by calling 1-888-909-6757.