I bought a few of these. They work fine. Whatever you do don't get zerolemon, they swell
Sources/Notes to self
https://www.ifixit.com/Store/Parts/LG-V20-Replacement-Battery/IF357-004-1
https://www.amazon.com/Genuine-BL-44E1F-3080mAh-LG-Non-Retail/dp/B01MSESWO6/ref=sr_1_5?s=wireless&ie=UTF8&qid=1542827205&sr=1-5&keywords=lg+v20+battery
Offbrand
https://www.amazon.com/YISHDA-2x3200mAh-Replacement-BL-44E1F-Warranty/dp/B0722S1T67/ref=sr_1_6?s=wireless&ie=UTF8&qid=1542827205&sr=1-6&keywords=lg%2Bv20%2Bbattery&th=1