I am considering the DiveX Blacktip series and looking at the Tech model as the primary choice but when I looked at the Travel model specs, they appeared to me as the same as the Tech. model with the 12 Ah Batteries. I was expecting that the Tech. model to have longer range and run time and more thrust. What am I missing here? Why one would buy the Tech. model if the travel model is less expensive, lighter and less bulk?