current load

Really lost with first 2 battery mech! I picked up a Noisy Cricket on a whim and have no clue how to figure my voltage and current for a series circuit. I am using 2 35A 3000 mAh 3.7v(4.2v on full charge) IMR18650 batteries. Does my voltage double in series? And what happens to the discharge...

I've heard and seen supporting evidence of two opposing theories on whether or not battery life is conserved at low resistance and in an opposing theory that low resistance correlates to faster battery drainage. From my interpretation of Ohms law V=I*R in conjunction with P=(V^2)/R or P=I*V...