Chainsaws that run on gasoline are the most powerful and capable models overall. They don't limit the user by either cord length or battery charge time, and they can run during a power outage with no problems. On the downside, gas chainsaws tend to be heavier and noisier than electric or cordless models, they require more maintenance, and they pollute the air with unpleasant-smelling fumes. Light-duty gas chainsaws, priced between $150 and $300, are suitable for clearing brush, cutting firewood, and removing dead branches. Larger, heavy-duty chainsaws, sometimes known as "rancher" models, are good for larger properties and tougher jobs, such as removing full-grown trees; they cost anywhere from $200 to $450. (The still more powerful "professional" chainsaws, which sell for $500 or more, are not covered in this report.)Electric Chainsaws
Although not as powerful as gas, electric chainsaws offer several distinct advantages. They're much easier to start than a gas chainsaw, as all you have to do is plug them in and squeeze the trigger -- and as long as you have access to a working electrical outlet, they never run out of fuel. They're also lighter, quieter, and easier to maintain, and they don't spew exhaust into your face or the environment. However, they do require a heavy-duty extension cord, which confines you to a limited range — typically about 100 feet — and makes it unsafe to work in wet conditions.Cordless chainsaws
Battery-operated chainsaws aren't as powerful as gas models, or even corded electric ones, but they offer unlimited range and all the environmental benefits of an electric model. Powered by rechargeable lithium-ion batteries, they're super-convenient for working in trees or other awkward situations, and light enough to carry over large acreage for small, scattered jobs.Chainsaw Sharpeners
Even the best chainsaw only cuts well if its cutting chain is sharp. At $10 to $30 per chain, replacing the chain every time it gets dull really isn't practical, although it's not a bad idea to have one or two spare chains in case you need to swap out the chain in a hurry. In most situations, though, it's more practical and cost-effective to sharpen the chain yourself when it gets dull. Chainsaw sharpeners for home use range in price from $10 for a sharpening burr that works with a rotary tool to over $200 for a bench-mounted grinder. However, a good, basic electric sharpener shouldn't set you back more than $50 or so.