It is highly recommended to calibrate each new FPV battery charger before use. This will help avoid potential problems in the future with your LiPo/Lion batteries, and can also significantly reduce the time of final cell balancing after charging. For example, before, one of my chargers could pretend to balance something for another 15 minutes after completing a quick charge, but now the end of a full charge occurs no more than a minute after completing a quick charge.
I have 4 chargers, two ToolkitRC M6D, one Hota D6 Pro and one ToolkitRC M7 and all of them had a tendency to overcharge some cells, some more, some less, but the factory calibration on each left much to be desired.
As it turned out, based on the results of one of the conversations in our local FPV chat, not everyone calibrates or at least checks their chargers, but even knows about such a possibility and necessity. And as a result of this conversation, this video appeared, fortunately, a friend brought me a couple of his chargers for calibration.
I hope this video will be at least theoretically useful to you.
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