Battery operated tools

I use DeWalt battery pushmower, string trimmer, and just about all my hand tools (drill, circular saw, etc). Have had great luck with all of them, but two things; 1. Have to get a big enough battery for the circular saw; 2. I turn over my push mower and scrape the clippings when I finish mowing...not sure what's up, but it clings inside the deck, so I fear it'll rust out early. And, same on the the sound...when I cut my grass, it sounds like I'm pushing a window box fan across my yard!