I had this problem before.. 100% before sleep.. wakeup 45%.. reboot, close all apps.. nothing change..

the problem only solved after I Reset All Settings... ! SOLVED... now my battery amat tahan.... hehehehe

full cycle charge (about 4 hours)

although after abt 2 hrs into the charging and it shows 100%, i guess it will still charge slowly wif "trickle charge".............meaning it will still charge slowly until it reaches the 4th hour. this way your battery will last longer as can be seen from your explanation........i too using an i2G and it last longer than my bro's 3Gs

but its really annoys.
after full cycle charge,about 10 min i make call the battery drop about 1bar around 10percent.
so you think is this the time for me to change new battery.3 years yo.

how to reset all setting bro?teach me

if you did "Reset All Setting" all your setting will be default.
so most of the power sucker from iphone like Data Push will be automoaticlly "On" then its more terrifing.

agree. 3g on, auto backlight on... everything being switched on. that's a kill.

yeah,just set back your phone according on what we have discuss before.

couldnt agree more! or get a juice pack if you are always on the go.

My iPhone 4 was at 100% last night at 11pm. It goes to sleep mode after 2 minutes, brightness set at approx. 70% with auto-brightness turned on, left my WIFI on the whole night, turned it off at around 7am the this morning, used 3G for about 2 hours or so for the day, some messaging, no calls, and my battery is at 42% now. How normal is this? It drains pretty fast if you ask me.

Anyway, do you guys leave cellular data (and therefore EDGE) on always? I keep getting the Turn Cellular Data on message if I turn it off.

go here.. malas nak copy again...

http://oyak.net/bateri-iphone-4/

damn! i havin' this problem for the first time too

charged 100% full before sleep, 7 hours later the percentage drop to 79%. standby for 7 hours already eaten up 21%, this is really abnormal. triple checked there is no background program runnin'; turned off everything (only airplain mode is on)

already reboot & now observin' how this thing goes wrong again...

Different for me.. When I go to sleep, my IPhone Battery is at 53%.

I wake up at 10.00 AM, battery still at 49%.

Then untill evening I use at 5.00 PM the battery is at 21%.

Is that normal?

Wicked.apple also advise to reduce battery drain issue,you have to do the following;
-Set brightness below 50% appox
-Off Auto brightness as its sucks more battery power
-On Wifi is nessasary.
-3g data

From what i see,you frequent uses Wifi and 3g data,which is the culprit behind all other power sucking coding.
Any did you know,Data Push also sucks power.Data power mean push message from email,facebook,twitter etc.....

What model you using now ? Apple always advise us to keep update on the latest firmware as latest firmware got bug fixed.Same like my iphone 2g.I thought the last version is 3.1.3 that has no bug fixed.I download direct firmware from apple got battery drain issue bug fixxed.
Some stuff like that.
Since Aeroplane mode wont suck you battery power,there something wrong on you battery.
Its ok,if your phone carried by Malaysia Carrier,bring back to them and have a check.Who knows,you might get a new replacement phone.

i think its normal.normal data usage.looks normal to me.
Mine worst.
Waiting from Yezhaholic for battery replacement.

Just now I charged my IPhone 4 untill full 100%.

I played a bit and the percentage drop 2%.

I can actually see how fast the battery power dropping.

Is that normal?

mine also same...

5 mins of pressing, clicking, playing with the phone..already drop few percents

if 3g/wifi...lagi fast

Meaning that is normal right?

aHaha..

i guess so

need feedback from experienced ip4 users

it is normal =) im using iphone 4..

93% to 91%, just 4-5 sms......no wifi, no 3g, no other apps running

i think i should OFF the battery percentage readings, haha...

my advise off it.hahaha.
you dont feel number loosing as well.haaha