LG G3 (D855) OTG capability/how much juice?

Hello
I'd like to know if anyone could tell me how much juice can be drawn from the G3 (D855) OTG. Or how much OTG in G3 compare to Samsung galaxy s5's OTG in output.
Thank you

Phone charges much faster in TWRP recovery

Like i mentioned in the title my phone charges way faster in recovery mode then normal. Is this normal or could this break my batterie?

How much usable free space on 16gb 5x?

Can anyone that has a new out of the box 5x, 16gb tell me how much free storage space there is on the phone?

Thanks!