I am going to purchase a Fein Oscillating tool, however I am having a very difficult time deciding between the corded and the cordless. I'm afraid the cordless will not have enough power and that I will constantly be changing batteries. Any thoughts?
They are expensive to start with, I believe the tools/cutters are proprietary?, and the batteries may also be expensive.
You can get a Rigid, I have one, and then get more Rigid tools which use the same battery, like my drills, impacts and circular saw, all cordless, 18 V LI. Stay with one brand and get enough batteries to go around. The Rigid batteries show "state of charge" so you know when they need charging. They are lifetime guaranteed as well!
Having said all that, I also have full line of Milwaukee drills, drivers, automotive impacts , and circular saw. They also have a stae of charge indicator, are LI, have a long run time depending on the battery size even longer, run and stop real smooth and I love 'em.
Having said that, I started with Dewalt 18 volt NI Cad, still have some that work OK, and 2 milk crates full of dead batteries. It was cheaper to buy a new drill driver which came with 2 batteries, than to buy 2 new batteries, so I kept buying new drills. The chucks in the drills don't hold the bits any longer so I'm fazing them out in favor of the Milwaukee and Rigids.
An osscillating cut off tool isn't a "power hog" so your battery life should be fairly good. Here's a review of the corded types: