Chosen Solution
As the title says. Have replaced the phone’s battery thrice. Have calibrated all of them and have fully reset the phone via its option in the settings. Still, this son of a ##&&%’s draining original batteries at 90% their original charge like they’re at 20%. There isn’t even any abnormal heat off of it. I don’t know what else to do.
Rapid discharge can be caused by a faulty Tristar IC. Otherwise, you may have a modular component that is drawing excess current. The phone won’t normally get abnormally warm/hot even if it is. If you turn brightness on at full, set the Auto-Lock to never, close all the apps but leave the radios on, the phone should last around 4-5 hours. If you’re not getting that, then consider using only the screen and battery and test it that way. That eliminates most of the modular components. Then try it with a known good screen if it stills drains quickly. In the end, you will be left with only the logic board as the culprit.
