DNA 75 Battery Problem

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Hello all, 


I have Hcigar vt75 nano mod. I installed sony vtc 6 zero battery to mod. In mtl 10-12 watt, My battery percentage is decreasing too fast. When battery %50 with 5-6 puff , battery is falling down to %40.  Same way, in 5 minutes charge, battery is increasing %10- %15. Where is the problem ? batter, firmware or chip ? Also, Can anyone share firmware for vt 75 nano ?

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It is probably the battery or a connection issue between the battery and board, I seem to remember on some of these there was a screw near the battery cap that came loose and caused issues there is a thread on here somewhere about that, sorry don't have the device or time to search right now. 

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