Tripley

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 ?