I bought this and it was the real deal, but the price is now inflated for some reason (I paid $50): http://www.amazon.com/Genuine-Original-Standard-Protective-BL-45B1F/dp/B018PEE94K/ref=sr_1_5?s=wireless&ie=UTF8&qid=1454516615&sr=1-5&keywords=LG+V10+battery
I got this one: http://www.amazon.com/dp/B018PEE94K?m=A28CO0GI96ZGPX&ref_=v_sp_widget_detail_page
It's legit, works great.
Genuine OEM Original LG Spare Extra Regular Standard Li-Ion Battery + Protective Case 3000mAh BL-45B1F / BAK-110 For LG V10 Phone (1x LG Battery) https://www.amazon.com/dp/B018PEE94K/ref=cm_sw_r_other_awd_BNaPwb5QFXBT9