I had my phone on overnight, 7hours(with obviously no use but all connections available) . Stayed at 28% the whole wU through! Biggest drains I've seen are screen obviously, but also wifi seems more thirsty than HSDPA. Are there any apps to customised auto brightness? It's always too bright indoors, but useful when going outside.
Swiching auto brightness off isn't much of a fix?
Strange, for me on the desire, spica and one s, wifi drains a lot less power than a mobile data connection even even when I have a constant H connection.
Not that I know off, only way is through custom ROMs, maybe? But on all devices auto brightness doesn't seem that great anyway and just consumes more battery life.
Best thing to do though is just use switch pro or something similar for the brightness and place it on your homescreen for manual control.