I’m using /e/ on my LG G5 and there is a problem with NFC (ticket already opened on Gitlab). The toggle is greyed out (randomly “on” or “off”). And it could be the cause of battery drain (10% in 10 minutes, using the phone).
I’ve found a thread with the same thing (on LineageOS 14.1 with MicroG) and there is a fix : https://forum.xda-developers.com/lg-g5/help/nfc-setting-grayed-t3889457
So how to flash/install a NFC driver ?