There are two distinct sides to this product. One is the extremely good value for the components alone - including two seemingly decent batteries and a matching charger. The other is the fact it's a competent little chainsaw with absolutely no interlock to reduce the risk of accidental operation. And that's not a great thing for chainsaws as they have a voracious appetite for human flesh.
The unit does at least come with a small shield to reduce the risk of injury due to kickback (When the blade suddenly bites and throws the unit back forcibly.)

Other gardener-style reviews of these common units rave about how long the battery lasts, and how effortlessly they cut through branches. It certainly made short work of fresh and old dried out branches when I tried it.

Internally it's very simple, just like other modern cordless tools. A fairly rugged battery connector, common pulse width modulation speed control and a motor with a thermal trip/fuse attached to the side. (Possible failure point?)

The gearbox is made of plastic with steel gears and is very minimalist. The motor cog drives directly onto a larger cogwheel with a long sleeve bearing. That larger cog has a keyed shaft for the chain drive sprocket, which is held on by a wire circlip/snap-ring.

As with most other chainsaws the chain rides in a bar, which is a sandwich of two metal plates spaced apart to guide tabs on the inside of the chain. That bar can be moved forwards or backwards to tension the chain correctly at a point where it's not so tight that it binds on the guide bar, and not so loose that it can skip out.

Full size chainsaws have a simple oil wicking system that keeps the chain lubricated with a very sticky oil. This one has no lubricator and is not supplied with oil. I added some around the chain and bar before using it.

The charger's LED indicator is a very crude current sensing circuit that will indicate that the pack is at least near full charge. It appears to be using the lower voltage of the red LED to extinguish the higher voltage green one.

If you get one of these units I strongly recommend removing the battery when not in use, as an accidental operation of the trigger will cause serious wounds. Definitely make sure the battery is removed before adjusting the chain. Keep it away from kids and make sure you attach the anti-kickback guard. This unit will require extra care in use as its size and convenience belie its dangers.

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