i bought a new gens ace 6750 4s and i did a few cycle charges before i use it to break it in. Every time i balance charge the battery, cell 1 reaches 4.2 v faster than the others which sit at 4.11. It takes ages for the other cells to reach 4.2 v since the charger drops the current to 0.1a to balance cells out. I have checked internal resistance of the cells and its equal on all 4 cells. I'm using a skyrc d100 charger. Do i have a bad battery?