This device, as it seemed to me, is already closer to scientific devices than to household "charging". The charging process here is completely controlled, and for each of the 4 slots separately - you can, for example, set your own charge or discharge current for each. There is a quick test mode and a normal test mode, which allows you to accurately determine the actual battery capacity. I described the shortcomings in the corresponding section, but these are minor quibbles that do not spoil the impression at all. Unless I would gladly pay extra for a good case for this device.
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