No oil???!!!. As someone who's spent many days cutting through trees at properties that I've bought in order to clear a landscaping and/or a large garden area, a chainsaw (battery powered or gas powered) will for sure require bar and chain oil. You can't let the chain rub dry against the bar without lubrication. Doing so will relatively quickly cause severe overheating which, in turn, will likely cause damage including engine and perhaps battery failure.
No chain tightening? Then you didn't use it. Because use on tree trunks or thick tree branches will necessarily cause you to tighten it every so often so that it works optimally. Not to mention reattaching the chain altogether when it falls off the bar. That, too, happens on a regular basis when the chain struggles to get through a thick branch as is always the case with a battery-powered or corded chainsaw.
Gas is a simple matter for a gas powered landscaping tool as you can buy ready-mixed fuel at Home Depot or Lowe's. Or mix it yourself according to the 40:1 or 50:1 ratio. Just be sure to use that gas within 30 days as they recommend as "old gas" is the enemy of all gas-powered equipment.
The last sentence doesn't apply to gas lawnmowers as all can most likely be used throughout the season with whatever gas has been loaded into it.. Just don't let that old gas remain in the mower through the winter. It will coagulate and cause you to have to clean or replace the carburetor before spring use. Springtime is the time for many people to throw away their old lawnmowers because they can't figure out why that mower that worked so well during the previous year all-of-a-sudden won't start. I've picked up some incredible mowers that I confirmed the owners wanted to throw away after it was put out on the curb, spent less than an hour on total maintenance, and enjoyed the use and/or sale of an incredible mower thereafter.
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