Ego 21" self-propelled mower. My lot is small - I normally get 2+ cuts out of a full charge. BUT - battery was dead this weekend after one cut a week ago with a just-charged battery. Cut grass with second battery but when I collapsed the handle to put mower away, green light on battery remained illuminated/"on-line", which, it seems logical, is what killed battery #1 while the mower sat idle for the week in between cuts. Any ideas from the community? Thank you.