I had a Silver Maple removed. Per our contract, the company chipped all it could and left the larger logs and trunk for me to deal with.I bucked (cut to useable size) the logs with my 14 and 18-inch Ego chainsaws. They worked great. Most of the rounds and chunks were already picked up by many people for their fire pits or furnaces.I knew the 5-6 foot diameter trunk would be more difficult. I ordered the Ego 20-inch saw expecting the extra 2 inches and more powerful motor would do the job.I was right. The 20-inch saw tore through the trunk creating over 100 gallons of wood chips/dust. I had to reduce the trunk to about 25% of its starting size so the City would pick it up.I used 3 - 7.5 Ah and 5 - 5.0 Ah batteries with 3 quick chargers. As soon as I depleted a battery I put it on a charger. I limited myself to 3 hours at a time and the 8 batteries were able to keep up. Do not expect to use this saw hard with only 1 battery. To get full speed out of it you need a 6.0 Ah or greater battery.I was very happy I bought the 20-inch saw although I think the 18-inch saw would have been able to do the job but would have taken longer.This 20-inch saw is heavy with the 7.5 Ah batteries but is manageable in vertical cuts where its weight provides a downward force on the chain. Horizontal cuts were tiring.