I, too, use a Greenworks 60V 21-incher; mine is self-propelled. I mulch 100 percent of the time. I welcome the Turbo mode and use it exclusively, coupled with the optional high-lift blade.
Are you by using the flat, thin, "Economy" blade that came installed? Or heavier, highly swept high-lift blade that came in the box? The heavier blade might force you into turbo mode---at leadt, when the lawn us thick, high, or wet.
I just noticed that you say you bought your mower in 2020. The Turbo mode was introduced on the dual-battery (Gen. 2) 21. I thought the Gen. 2 came out in 2021. Does your mower use one battery or two?
I’m using the original OEM blade. For the first few years you pushed the turbo to activate or it came on automatically when under a heavy load. Now it’s on constantly.
Just concerned about reading that constant turbo can affect battery life
