There's nothing new or different about these batteries you guys have...I bought a 901 over a month ago and one of the 2 batteries I got did the same thing, would light up and power on even when not screwed onto the atomizer. Usually a quick movement of the battery in my hand would always make it light up.
I contacted the seller and he told me before exchanging them to try sticking a straightened-out paperclip in the atomizer-end of the battery and carefully push around in there to try and straighten out the pressure switch which is activating wrongfully. I did this once, tested the battery again by moving it around and it definitely lit up less often but still did it. I tried the paperclip again and moved it around inside a few more seconds...
Ever since then, it's never done it again, over a month later
Try it.