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This is about the 20cm blade with two batteries.
Powerful tool!
At first, I put the chain on backwards but immediately realized it because it wasn't cutting. (It's mentioned in the manual!)
It cut through a 10-year-old Leylandii tree, 4-5 meters tall with a 20 cm trunk, without any hesitation and all the peripheral branches with incredible ease. For this job and splitting the trunk into 6 pieces for the fireplace, the battery went from 4 bars to 2.
I estimate/think that with the two batteries, it could take down, chop, and cut all the branches from 4 such trees.
The chain needs tightening about every battery change (you loosen the white butterfly that holds the cover first) and press the oil pump periodically while cutting. Get a large syringe to easily add oil because the container on the saw is very small..!
The difference from a small gasoline-powered one I have with this specific electric one: it is much lighter, makes much less noise, and takes a little longer to cut. With the built-in lubrication and the two batteries, it becomes a very easy tool - you press a button and cut!
There is theoretically the limitation of battery time, which doesn't exist with the gasoline-powered one, but for AMATEUR use on MEDIUM trees with a thickness of 20-25 cm, it is impressively good, silent, and easy to use!