Vivo V5s runs on Mediatek MT6750 Octa Core processor.
No. Vivo V5s is not a waterproof mobile phone.
Yes, Vivo V5s does have support for OTG.
Vivo V5s has 3000 mAh battery which is non-removable. It offers talktime of upto 12 hours on 3G networks and standby time of about 270 hours.