A:AnswerThe headphone volume is independant from your phones volume, however the watch does turn up or down your phone, it doesnt change that volume of the headphones.
A:AnswerNot really. They are definitely loud enough to drown out outside noise but not so loud they can clearly be heard by the folks around you. Also they remain clear sounding even at higher volumes.
A:AnswerI have done both and not had a problem. I more so use an adapter to charge them, honestly. I think for most chargeable batteries, letting them die and then charging them back up is the best way to keep the battery life going longer.
A:AnswerThey can be used for a gaming console(I've done it). Only thing is online chat can be annoying for others in the party. They told me they can hear themselves talking from my end. My guess is the built-in mic is picking up the sound from the earcups. But if you're playing without friends in a chat, these are great for games with their powerful sound.