You may know what overkill is; this is the same thing applied to what a gas-powered mower is for a small yard. Yes, there are smaller sizes available for smaller yards, but they do require a lot more maintenance and oil changes to keep them up to the mark. You should also consider the fact that a battery-powered mower will last a limited time but can get your work done within the time frame. Yes, they do have their minor faults like the battery running out before time and having to keep a reminder to unplug the battery if the battery is not smart. But the overall requirement of a small yard fits a battery-powered mower more than a gas-powered one. You can always opt for either of them but consider your requirements for your yard and then buy them to ensure you're not paying more for something you simply do not require.