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The safest (and often most expensive) way to go is with an OEM from the LG:
http://www.lg.com/us/mobile-accessories/lg-PAC63320502-v20-battery
or another option is to get an equivalent (go with an exact match) from a reliable, third-party retailer:
https://www.newegg.com/Product/ProductList.aspx?Description=lg v20 battery&Submit=ENE
or if you feel it's worth the risk, some vendors offer their own, custom solutions. ZeroLemon for instance has a pretty good reputation and it's selling this 10,000 mAh battery pack/case:
https://www.androidpolice.com/2017/...000-mah-battery-case-lg-v20-now-available-60/
Thank you. I wanted to go with LG but they don't sell the battery for the V20 anymore.
I have used many..many different aftermarket batteries for my LG devices over the years and never had a problem. I always purchase a brand that has a positive review history on Amazon for the basic protections of not blowing up or melting down and I have been good.
There are some basics that you should expect...
1) Battery life varies between not only the manufacturers but within the same brand & batch. Not by much but it seems that each battery acts a bit different.
2) The batteries last for years but with constant usage the chargers will burn out about every 8 months or so due to heat and the fact that there is not ventilation in those little plastic boxes. I have been able to prolong their lives by drilling a couple holes in the charger bodies to get a bit of air movement. but they are cheap to replace so no big deal buying a new one every 8 months or so.
3) On Amazon the battery capacity ( mAh. ) are fairly accurate but on Ebay you are dealing with more of a sketchy group of vendors typically from china and they don't mind adding a few ( mAh's ) to there description to help customers make there decision but if the batteries have the same dimensions they typically have the same capacity. So if you see a replacement that says " High capacity replacement 4200 mAh " and the OEM is the same size and is " 3200 mAh " then count on it being around" 3200 mAh ".
Had good luck with these brands : ( TOTHL, JUBOTY, Trendon, Sporting persistance )