DON'T BE SCARED OF BATT TOOLS!! LOL...WE LOOK AT SOME RUN TIMES AND DIFFERENT SIZE OF BATTERIES...THESE ARE ALL LISTED ON STIHL.USA.COM AND IN THE BATTERY BOOK AND THE POWER EQUIPMENT BOOK! IF YOU ARE INTERESTED IN A BIGGER BATT THAN WHATS IN THE "SET"...WE CAN "UPGRADE" IT..YOU WOULD PAY THE DIFFERENCE...BUT ALL IN ALL BATT CHAINSAWS, STRING TRIMMERS...ARE REALLY GREAT!! THAT BEING SAID...SEE YOU ALL IN THE NEXT VID!! #ERIE MOWER GUY #STIHL #BATTERY EQUPIMENT #GERLACHS POWER EQUIPMENT