The way I am putting the battery cap on is to go a few reverse turns until you feel it drop into the threads. Then it aligns properly and turn in down. The last thing you want to do is to strip the threads as everyone is well aware of so just go easy and don't try and rush things. I have been tempted to either put a tiny drip of oil or even ejuice but I am worried that will make for a poor electrical contact and increase resistance in the power circuit. Anyone tried some lubricant or would you say this is a no no?
This was also a problem with the S class. I asked varitube about it and they asked YiHi and they said it had to be that way because of the spring being at the top rather then being on the bottom. What you are doing is correct turn it backwards a couple of times to get it to take it right and be really carful not to cross thread it. You get used to it after a while. I didn't know that they say not to charge it throught the USB I do that all the time on my S. Every night actually and it works great. HMMM