Deck WidthThe deck diameter of your lawn mower dictates how wide a swath it cuts as it passes over the grass. Bag: The vast majority of mowers come with a grass bag to collect grass clippings. Self-propelled lawn mowers are a little more complicated, but make your life easier. Maintenance and WarrantyBecause electric mowers don’t require gasoline, oil, or air filters, they eliminate maintenance issues related to gas-powered motors. The only thing you need to check and replace is your lawn mower blade (you can also learn to sharpen it yourself).