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Initially, the vendor has positioned these as the sony vtc6 battery, with all the ensuing consequences. The capacity was 3000 mAh, the current was maintained up to 30 Amps, the weight of the original batteries according to 37 grams. As a result, something similar to sony vtc6 came, the problems began with the marking, the letters did not quite correspond to the original marking, but were Packed without complaints, even seams and there were signs of the original battery.
Test QSO batteries 18650 3500 mAh 30 Amps, the results are pretty good, considering the brand of the manufacturer. This is not a promoted plant Sony or Samsung, and no one unknown in Russia QSO. But the conclusion is that it is better to give preference to such a brand and get the declared characteristics than chase the super brand and get a fake. So, in order. The first part of the test was to take the battery at a charging level of 50-60% and charge it with a current of 2 amps. The result is presented on the chart.
For 7 years there is a boom of development of multi-rotor systems. The flagship among the companies of the upper level remains firm DJI, created by a Chinese student-enthusiast. Behind the domestic "kulibins". Alexey Moskalenko known as Alexmos, a software developer for gyrostabilized gimbals, the Creator of the systems of the radionavigation and direction finding 1Slon known developer search beacon Throuh etc. Of course, the crisis of 2014 diminished the ardor of the hobby community. This hobby is one of the most expensive cost, but enthusiasts continue to the development and creation of multi-rotor system in an effort to overcome some of the contradictions and myths.
The most popular batteries for multi-rotor systems. Despite the presence of a number of problems with their operation and maintenance, these batteries are deservedly respected. I will not dwell on the pros and cons of batteries, plenty of information in Runet. Will tell only about some peculiarities of their application in the quadrocopter and hexacopters.