Along with the Hyundai chainsaw with a 15 cm blade (which after a couple of cuts on branches, the switch gets stuck and you have to pull it to unstick it), I also bought a third battery for backup. The two batteries hold a charge for work, but the third one turned out to be defective. It works for a short time and then it's done. Overall, neither the tool nor the batteries are of good quality.... It is better to choose another tool that also has an integrated lubricator. Despite the power that the tool has, it is a complete disappointment.