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Should I risk breaking my LG V20?
(sh.itjust.works)
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I would practice soldering at least a few times before trying it on the phone, but at this point you don't really have a choice. Moving forward buy a phone like the Asus Zenphone10 which has the battery glued shut but the back is plastic which would make it far easier to remove than a glass back phone. And bonus this phone has a headphone jack as well.