I've had my TM since early May. When I first got it, the battery cap was so hard to tighten and loosen that I couldn't open it without tools. One day, the battery lid got stuck. I was able to open it with a huge screwdriver and a significant amount of force. Once the cap was off, I used my thumbnail and followed the threads on the battery compartment and found a pinched area. I used a butter knife and gently pried the pinch apart. Since then, I've been able to open and close the battery lid, no tools, no problem.I'm going to purposely stop cleaning the battery cap and see if anything happens but it was good for the first however many months and has been flawless since its arrival in February.
I haven't used anything to clean my battery cover. In fact, the only part that I have ever cleaned since May, is the stems and cooling unit. Not saying that this is good practices, I'm just a lazy ass.
Anyways, I think this device is amazing. I absolutely love it. The TM is definitely a hard hitter, and so far, I haven't had to deal with the abysmal CS (fingers crossed emoji).
The TM is a beast and my favorite vaporizer. But because of terrible CS, I CANNOT recommend this device........
........enough.