Very disappointed in battery life with healthy lawn

Everything seems to be ok (cut quality, build quality, etc.) but the battery life is terrible for our very healthy and thick fescue lawn. Cutting on the highest length, the 4ah battery only lasted about 15 minutes. I bought a 4ah and 2ah battery with a trimmer based on the quoted run times where an hour is all I'd need. As it is, I eat through the batteries faster than they can get any meaningful charge (5 minutes isn't enough for anything) and have to stop mowing to simply allow the batteries to charge. I'd need at least three batteries and two chargers and swap every 10 minutes to work continuously. My suggestion is to stick with gas if you have the type of grass that people compliment. Very disappointed considering the cost. Edit: At the close of the 2019 cutting season, we're still using the mower because I'm too cheap to buy another mower. It's held up well and we can accomplish mowing with two 4ah and a single 2ah battery (normally without charging required). Due to the thickness, it takes almost twice as long as a gas mower simply because it isn't as powerful and will bog down and not cut (note that I came from the gas size they say is equivalent - not at all true). It does a lot better if bagging - just stinks at mulching. Still wish I never made the mower purchase, but the other tools in the line are good. At least it is quiet and doesn't smell while also requiring only blade maintenance. Due to life we've had and maintenance, I added a star back.

###

