Greenworks 80V 21" Self-Propelled Mower (Open Box)

I do have to say that I am very impressed with the operation of this Greenworks 80V 21" Self-propelled lawnmower. (Greenworks 80V 21" Brushless Cordless (Self-Propelled) Lawn Mower (Dual Ports + Light), Battery and Charger Not Included (75+ Compatible Tools)) Since this is my first battery operated lawn mower, I was unsure on how long the batteries would last. I really couldn't tell from past reviews as yard conditions vary and affect battery performance. I purchased a tool-only version so I had to get some batteries on my own. I opted for one 4.0Ah Greenworks battery and one 3.5Ah Generic battery. Those original Greenworks batteries are so, so dang expensive. 1. Greenworks PRO 80V 4.0Ah Lithium-Ion Battery ((Genuine Greenworks Battery / 75+ Compatible Tools) 2. TenHutt 【Upgrade】 80V 3.5Ah Replacement Battery for Greenworks PRO 80V Battery GBA80200 GBA80300 GBA80400 Lithium ion Battery High Capacity This first mowing session, I used the self-propelled feature, probably 85% of the time. The grass was longer than I normally cut at also, it was about 5.5" and the mower was set at the #7 position, which I understand to be 4". Photos 1-3 show my back yard and one side yard (half of the other side yard was also cut as well as the curb strips in front of the house), there is an incline from the front of the house down to the back yard. Photo 4 shows that the 3.5Ah (TenHutt) battery was depleted and the 4.0Ah battery (Greenworks) still full. Photos 5-7 show the front yard and other side yard (half cut from back yard). Photo 8 shows the 4.0Ah battery (Greenworks) with two bars still left on the battery. I was very pleased and was maybe expecting 1 bar to be left. The lawn mower operated flawlessly and I was also surprised by how quiet the motor was. I did have to get used to the self-propelled feature. As noted in other reviews, it does take a second to engage and disengage, with a rotation or two to unlock the drive wheels on disengaging. Engaging was no problem, on disengage you just have to release the drive handles about one mower width before you want to turn. At least that is what worked for me. Photo 9 shows the vertical storage position and also how clean the deck was. This was the first time I tried a silicone spray to keep grass from sticking to the deck and I think it worked well. Photo 10 shows the silicone spray used. Photos 11 and 12 show the Ah's of the batteries that were used for the mowing session. Small update. Still very impressed withbthe 80V mower. As picture states, 4th cut at height 6 I had three bars remaining on the Greenworks 4Ah battery, the 3.5Ah generic was depleted. Was mowing at height 6 because lawn was thick and it had rained heavy yesterday with more on the way.