Temperature protection (or whatever/however it's displayed in that mod) typically means that in TC mode, you have reached your upper temperature limit. The mod then throttles back on wattage to "protect" the coil temp from rising above the upper limit set. You can continue vaping, and that message should go away. This is assuming you are using TC mode correctly, and with the right type of coil (SS, nickel or titanium). If temp protect isn't going away after the mod cools down, that either means there is something wrong with the TC setup, or the mod isn't performing correctly (could be electrical, could just be an issue with settings.)
Best of luck, I wouldn't be worried about your batteries in this situation. "Temp protect" is concerning the temperature in your tank, not the heat and/or strain with your batteries, in most cases. I can't see a reason to not use your batteries, but you may want to watch a video review/demo regarding your mod and its settings. I do that with most of my new devices, not so much to hear what the reviewer thinks of it (although that can sometimes be helpful) but I find it easier than trying to "decode" the "written in google translation" instructions that sometimes arrive with the mod. Fairly often I find them to be not that helpful, other than getting the vaguest sense of what the equipment can do.
Best of luck, I hope you get it figured out.
Anna