Hello Nooo.
Thank you for reaching out to us. We are sorry to hear that you are dissatisfied with the run time of this battery when used in this blower.
Greenworks 80V blower provides up to 70 minutes of runtime (on low/speed 1) with included 2.0 Ah battery. To extend your run time, try using the blower setting on a lower speed when high speed is not a requirement, as blowers are considered a high-power draw application which means they do tend to drain the battery quite rapidly in comparison to some other tools. Alternatively additional batteries can be purchased to extend the run time. This unit is compatible with Greenworks 80V batteries; please keep in mind, the higher the ampere-hour (AH) rating is, the longer the run time will be. Please keep in mind, a 2.0Ah battery does allow for better balance, and control. You will also feel much less fatigue with the lower ampere-hour (Ah) batteries due to the weight.
We are sorry to hear the unit is creating a high pitch sound, and we would like to get some more information as to why this may be happening. Please allow our team to gather some further details so that we can help find a resolution for you. We kindly ask that you give us a call at 1-888-909-6757 (1-888-90WORKS) or start a Live chat on www.greenworkstools.com. All we ask that you have access to the unit, battery, charger. The serial number and receipt so that we can complete troubleshooting with you and gather necessary unit information. We look forward to helping you better.