Whenever the phone is sitting around, it barely uses any battery - it can be sitting around for over one hour, WiFi and BT on, getting notifications etc., but the battery maybe loses one percent. If I have a phone call, I maybe lose 1% every 5 minutes or so - that's still fine by me. However, as soon as I am "using" the phone and keeping the display on to read emails, text, or browse the web, the battery plummets and I can use up 10% in 10 minutes.
It almost seems like there is a hardware issue with my display causing the extreme power usage. I am on my fourth battery - the first one was replaced with one from ebay (said "original, but you never know) when it didn't last over a day anymore, that improved it for two months or so before it degraded again. Then I decided to spend 40€ on a genuine one directly ordered from LG's spare parts site, but that also only held up for four months or so - and now I'm using a battery from ebay again which has been used for maybe a month (and then sitting around, being charged occasionally), but I struggle to make it until 6 pm without recharging.
Do you have any idea what could be wrong with my phone? Could it actually be an issue with the display itself?