I didn't charge either of the two I ordered when they first came since mods like these as well as batteries come with a fast precharge to insure they are good not doa upon arrival being found in working order. I ran each for a week before the initial charge took place to be sure they weren't going to be seeing any type of defect and have been satisfied so far with the results.
When looking into that here I hear a slight sound but it isn't the button but the ejuice in the small tank slushing around which can sound like a loose button. The main button is under some form of spring tension either by a spring or flexible bar inside since I won't need to take it apart to find out. Listen to see if what you are hearing is coming from the tank you have on.
I was reluctant at first when people kept wanting to know where to get them and ended up price shopping all over until grabbing one from each of the two vendors. They eliminate the need to carry a long 1300mah VW battery or bulky mod. With the bending adapter on and using a Smok Tumbler or other small size tank they fit right into the watch pocket on a pair of jeans as well as a coat pocket. I won't carry them in a shirt pocket however since they are too light and can easily bounce out on you.
You won't believe this one that comes as no big surprise however since once one good mod comes out someone else has to out do it! This one isn't quite a review on the iStick but a newer 30w version with a flashlight and usb output port!
Eleaf iStick 20W Review ??? no , new 30w beyang 3.0 30w box mod huge vapor
Right now this seems to still be on pre-order status and I have to wonder if it would still take the bending adapter or not since it resembles the iStick closely.