Please, Did you try to replace other battery pack which is greater than 2.600 mAh? Some of my friends said the cell board is only memory at 2.600mAh regardless of bigger capacity. It means if i replace bigger cell (3 x 3.000 mAh), it still recognize the whole package is 2.600mAh at maximum. Does it true?
I have never been change new battery in Goplay 3 but I think it can replace new one by increasing capacity each cell. Such as 18650 to be 3600 mAh per cell (3S 11.1-12.6V). In case of HK for my opinion I've never found it remember the capacity of the original battery.