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4 hr and 30 min seems pretty low. I usually get at least 6 hours and up to 8 hours. Wi-Fi only at home and I only turn on data and location when I'm out. And just a tip. Dont let your battery die, it hurts it more than anything else. I was careless at times and learned the hard way.
Heres the screen protector I use: https://www.amazon.com/LK-Protector-Flexible-Lifetime-Replacement/dp/B07VQDPNRS/ref=mp_s_a_1_3?keywords=lg+g8+lk+screen+protector&qid=1574092649&sprefix=lg+g8+lk+&sr=8-3
This one works great but watch the online tutorial twice before you do it. Tricky, but if you do it correctly it is marvelous. LK [3 Pack] Screen Protector for LG G8 Thinq, [Flexible Film] HD Clear Bubble Free with Lifetime Replacement Warranty https://www.amazon.com/dp/B07VQDPNRS/ref=cm_sw_r_cp_apa_i_L8x0DbTMKWW1N
This is the one I used, I have no affiliation with them I was just very impressed.
This is my 2nd G8. I dropped the first one and cracked the screen - bought a replacement and a pack of these. It comes with 3 so I threw one on my old phone for the hell of it. It had a few bubbles but they disappeared by the next day somehow and I was able to continue using it before my new phone arrived. My new phone came and I somehow fucked up the 2nd install. Last one I nailed and I literally cannot even tell it is on my phone - so highly recommended!