Per title, got my first EGO products this summer, the 21" mower and the trimmer. Very happy with both and impressed with the battery life - get ~3.5 rounds of mowing and trimming out of each before the batteries need recharging, and that's letting the grass get a bit shaggy. My initial understanding is that I can run both batteries (7.5A and 2.5A) til they are basically dead w/out negatively impacting battery life or ability to fully charge. However reading some of the comments here it sounds like maybe that's not the case and I should be fully charging both batteries after each use. So what's better - run until the are dead, or charge after each use?