Hello psigos.

Thank you for your review. We are not sure what specifications you are referring to, but we regret to hear that you do not recommend this product. Many customers have had great success with this model and come to enjoy it in our product line up. We wish it could have provided the same experience for you.
With the included 4Ah battery, you can expect up to 45 minutes of mowing time, in ideal conditions. Runtimes can vary depending on a few factors, including but not limited to using self-propelled, self-propelled mowers do use more battery than standard push mowers as more power is being demanded from the battery to run the blades and the wheels. Grass texture and consistency. Cutting height and lawn size. For added runtime, we recommend purchasing an additional batteries. If you have batteries from another 80V kit these 80V batteries would be compatible with your 80V SP mower, please note, the higher the Ah (amp hour) the more runtime a battery will provide. We recommend a 4Ah battery or higher for optimal runtime. The good news is you don’t have to wait until the batteries are completely depleted prior to charging them, lithium-ion batteries do not have a memory effect and charging them when they’re not fully depleted won’t do any damage. It takes about 30 minutes to charge the battery, and you’ll know when it’s ready because the light on the charger will turn from red to green.
If you don’t let the grass, get too high, you’ll be in good shape as far as getting an even cut. However, if you’ve let the grass get long, you’ll likely need to make a few passes for it to look even. One of the ways it’s able to provide a consistent cut is its sensory technology. This technology senses how tough or high the grass is and adjusts the power output accordingly. So, if you’re going over a flat area with low grass, it won’t put out as much in the way of RPMs, and if it hits a tougher spot, it ramps up the power to keep up.
We would like to address your concerns with the back wheels. The self-propelled feature is not usable in reverse. They are designed to lock when pulled back to prevent damage to the drive belt. If you are using the self-propelled feature, the mower will attempt to move forward and will be difficult to move backwards. You would have to release the self-propelled lever to pull the mower backwards while still holding onto the start lever. We hope this information provides a better overall user experience.

Should you have any further questions contact us through Live Chat on www.greenworkstools.com or call Greenworks Pro toll-free helpline 1-855-345-3934.