Gas powered yard equipment replacement -Poulan Pro

I bought EGO brand 56 volt 7.5 amp/hour battery powered mower probably 7 or 8 years ago. I always stored it by folding the handle over and standing it on end the way it's intended. After about 4 seasons, the self propel quit working. I think it may be a broken wire from folding and unfolding the handle. So I took it to my parents to use for trimming and bought a new improved one. I also bought an EGO string trimmer, leaf blower, and chainsaw. All the batteries interchange even though they are different sizes. My 7.5 amp hour mower battery will run for about 45 minutes. Sometimes I finish my lawn, sometimes I don't but then I just pop in one of the 5.0 amp/hour batteries to finish. All 4 tools were upgraded versions but not the most expensive.
It sure is nice to not have to keep gas and oil on hand. No pulling on ropes to start. Just pull the trigger and they start right up. Beside running quieter, I don't get any heat or gas fumes blowing off of them. And the battery on my 7 or 8 year old mower still works fine. The charger actually conditions the battery over winter when it isn't being used.
I worked along side a neighbor with his gas powered chainsaw clearing some fallen trees a couple years ago. My 5.0 battery lasted all day because it wasn't constantly running. I felt sorry for the neighbor having to restart his every time he picked it up.