Hey man,

My battery is ok. I've had mine for nearly a year, will be in FEB. Found this replacement on Amazon for you: LG Replacement Battery for LG G5,Bulk Packaged (BL-42D1F) https://www.amazon.com/dp/B01FBJ2HCS/ref=cm_sw_r_cp_apa_p-TdAbQW21A67

I charged mine to 95% last night and now it is at 85%. I disable location/GPS, Bluetooth, and turn on Wi-Fi at night. I generally leave those functions off unless I need them. I also setup Battery Optimization and Game Saver under Settings > Battery, etc. Also, I close out any apps that I am done with and don't allow them to run when not using them. Let's see... I use NetGuard to disallow any apps I do not want to access the internet. Display brightness is almost always on auto. I'll add more if I can think of it.