Thumb Score: +35 Almost everything on the greenworks site is 20% this weekend. Use code NEWYEAR. Ends 1/24/21. Many batteries are already sold out. I have been waiting for greenworks to release the 80v version of the power inverter for some time. It just came out and is included in the 20% off sale. By my calculation, a 4Ah 80v battery would be equivalent to 320 Wh.