Your mesh is likely not TC. Additionally while mesh requires pretty high wattage, and may burn through juice and batteries.
TC may or may NOT use as much juice or batteries to be frank. That is largely dependent on yoru resistance and settings, and you do have to factor in the power needed (although I don't know how much it actually is) to monitor the temperature of the coil. However, many TC designs want you to start with a ramp up wattage, which is quite often the wattage range you might like for the coil, and that again will depend on your vaping style, your typical coil resistance and how much "watt" or "temperature amount" you find to be a satisfying vape. So, typically TC is used to avoid dry hits and to maintain a consistent temperature in the tank, which may be high or low depending on how you like to vape. Honestly, it's more about avoiding overheated tanks too which can produce byproducts in your vape that may not be desirable.
Additionally, the legend from other users I have heard can be a bit complicated when it comes to TC and some folks find that it's a bit overpowered IIRC, and have had to use customized TC curves to make it work well for them.
I would just vape wattage for now, if you are concerned about TC down the road try this thread and talk to other users about it it's useful too because there is a Geekvape rep there who can answer you questions first hand. Also, if you are concerned about battery life there is information on the latest update to the firmware, and if yours is not fully updated, this will greatly increase your battery life, if you are up for it. It was my first mod update and I'm glad I did it, battery life was a ton better etc.
Welcome,
Anna