When connected, it shows the approximate charge time, it showed 2 hours on one battery, and after 20 minutes the go LED lit up, that is, the battery is ready for use. On the second battery, the LED blinked - 8 hours before the end of charging, and after 5 minutes the go also lit up, but this battery was already charged. It is not clear how long to keep the charge maintenance LED on, you need to try it experimentally. In general, there is only one drawback to charging - the price.
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