I got one of these about a year or so ago, and I’m pretty happy with it. At that time, it came with 2 batteries, and I had to buy two more to be able to complete my front yard on one charge (about 1/4 acre) - it varies a lot depending on how tall I let the grass get. (It takes a while to wait for the batteries to cool down before you can charge them, then it takes a good while to charge them, so if you run out of battery, you’re pretty much finished for that day.) But still, overall, I like it. I don’t have to mess with gasoline, and it always starts right up (unlike my experience with gas mowers.) 
I thought I scored one of these but when it arrived it was a cheaper Greenworks corded mower that was definitely not a score.
I’ve only had my cordless greenworks mower for about 1.5 months and the battery would not charge. Half my lawn is mowed the other half I now have hire someone to finish it. $200 and now worthless.
Hi there. Remember that you have a warranty with Greenworks:
Warranty: 3-Year Limited Warranty