You can use any newer Echo 18v battery. This thing cuts through wood like butter. Would not be good for cutting cord wood. I'm very pleased with what this saw can do. I have their line trimmer and pole saw.
Echo CS-352-16AA Features & Specs
Side-access chain tensioner for quick and easy adjustments
Reduced-effort starting system with digital ignition provides easy starting and smooth acceleration
Purge bulb for easy starting
Tool-less, easy access air filter cover makes tune-ups easy
Automatic oiler keeps the chain lubricated
Editor's Impressions Of The Echo CS-352-16AA
Cutting Power
Tool Motor Power
Chain Alignment
Value For Money
Build Quality
Feature Set
Echo CS-352-16AA Final Thoughts
"Power is good."
It went though them all rather easily. Luckily I haven't had to use it yet. Came as described and in great condition. This saw seems to have a lot going for it. Nevertheless, this saw is fun to use.