HI coconutron, hows going? Standby mode dropped 3-10% I would say its normal wor. But your day time usage is abnormal. IOS 4.3.3 might be the culprit after all. I'm experiencing the same thing myself with my oldie i3gs.

Hi Guys,

I think I m experiencing battery drain as well. Normally i charged my phone fully before I sleep that will be about 12am...

Then whenever i get up..i should still have about 97% at 6am

However, nowadays I only have 93% despite turning everything off.

And on average day time with hardly any usage, my battery drains at a rate of about 7-8% / 2 hours....is that normal ?

erm
my iPhone 3GS only have 1 and half year life
but since last year dec or earlier
if not mistaken
after 4.2.1
my battery is getting bad (not yet worse)
and still not enough 1 year
only will auto off around 20% or sometimes lesser a lil bit
but wont auto off when using apps
canot remember until which version
really canot use my phone to the full potential at hall
or even half
charged 100% and use within4 hours
already auto restart when i surfing or using fb
with no notifications

btw just now tried to calibrate my phone
auto turned off after down to 1%
i charged a while then it shows charging with 5% battery

p/s: I noticed it charge up very fast
now already 70% within 1 hour or 1 hour and little more

last time need charge around 3-4 hours only can get 100%