> ...I don't know how many you'd need to have in rotation... My lawn mower 5Ah @56V (EGO power) is good for half an hour. It charges from empty to full in mayb

> ...I don't know how many you'd need to have in rotation... My lawn mower 5Ah @56V (EGO power) is good for half an hour. It charges from empty to full in maybe 40 minutes. In a trimmer same battery seems to last forever, maybe at least 2 hours.