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Dear Artem,
Thank you for contacting us.
It will take less time to get the batteries a full charge with external charger.
If charging the batteries in the device, there may be a possibility that not all the batteries can get a full charge due to a large voltage difference between batteries.
For better charging the batteries, our suggestion is to charge the batteries with external battery charger.
And if want to charge in the device occasionally, our receommended charger is 5V 1A.
Thank you for your support.