Thanks. Most people in these forums understand that this device could have been the king with a great 1080p display, but LG is targeting the masses. The majority of the masses will attract to the display spec and nothing else. Users with light to medium use should see good battery life, but your light use contradicts that assumption.
The ambient temperature impact is my concern and expect people that override the throttling to have some nasty surprises with heat, performance (ironically) and battery life.
Added: If 90% for brightness that is a high setting for the display and could drain your battery much quicker. Try 50% if you still want brightness, but better battery life.