Anyone encountered the batt draining issue?

Hmm, I'm getting pretty worried about my iPhone 3Gs. It's generating quite alot of heat, so I was wondering, is it normal that iPhone generates that much heat? I understand that using any phone for a long time heat will definitely be generated but my iPhone is generating heat at a worrying level with just a short usage duration. Also, my phone is using a rubber-like full back casing which I purchased from Machines, could that be the problem? What worries me the most is that, back then, I came across a blog or article, saying that there is a case whereby a white iPhone went overheated and it somehow burned or something similiar to that and left some pink-like markings on the back of the phone cover. I've lost the link to the source and I don't know the reliability of that source which makes me worry even more.

Also, it seems like my iPhone battery duration is very very short. The battery level depletes very fast even when I'm not using it. The phone said that having 3G on will decrease the battery duration so I turned it off and yes I think I do notice slight changes but still not at an ideal level.

Lastly, I just got my iPhone from Maxis for about 3 days so my knowledge about iPhone is very limited, so please enlighten me. iPhone 3Gs do have bluetooth right? The bluetooth here ONLY refers to pairing with other devices which means I can't receive any files from other phones or send any files out? From my understanding, bluetooth enables user to transfer files across, so was wondering, is it my phone's problem or? I also went to look for alternatives to transfer files and I found Cydia. I know that in order to have Cydia working, I'll have to jailbreak my phone and Cydia works like an app store. In Cydia app store, there is an app which enables file transfering, right? I know my next question is a very preference base question, but do you all think Cydia is worth getting as I know by jailbreaking iPhones, it will void the waranty of the phone. Just wanna listen to some opinion. 

Alright, I guess that's all that I wanna ask. Thanks in advance!

Hmmm, your reply kinda worries me, lol. Yes, we couldn't clarify if every 3Gs user is having this problem but why only "unlucky" ones get em? I thought Apple uses the same hardwares in putting the phone together? and after all the debates and discussions, we're safe to say that the problem is from the software but not the hardware, no? However like I mentioned in my earlier post, I downloaded an apps called "BatteryStatus" from the apps store and when I have my phone fully charged, the Battery Status shows my estimated duration of my battery at different kind of usage and I found out that the duration is same as 3G but not 3Gs from what Apple displayed at their site. So I'm puzzled here. Battery Status not being accurate or did I get an iPhone 3Gs with an iPhone 3G battery?
As for your question idoblu, I'm still using my iPhone quite often now with wi-fi on. So I can't really tell ya the result yet but later before I sleep, I check the battery and have everything turned off while letting it idle. Will update you with my finding later.

@teikwing
I had number 1~5,7,8 off from your list and it's same for me for number 6,10,11,12 like yours. The only different is that I still have SSH on as I still haven't read up on SSH so I don't dare to turn it off. Haha and you got to nearly 2 days of battery lifespan, mine barely go over half a day. Sad 

offtopic:-

'iBluetooth' is compatible with OS 3.0 but not compatible with i3gs and itouch2g, dunno about OS 3.0.1

i am an iphone 3GS user for 2 weeks...having iphone problem.. serching for help.. here is my iphone problem:

- the phone is hot all the time when charging..
- in the same time, the iphone battery always running low( battery are consumed fast even in power safe mode)
for example the battery is consumed 80% for just 3 hours time(with power safe mode, not playing games or music)


here is the question:
-is that normal for every iphone?
-is if not: will it be the battery problem or setting problem?

could anyone answer this ? thanks n appreciate...

but of course i will definately go back to Maxis to complaint about this..since is stil under warranty..

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Added on August 9, 2009, 12:54 am@Jasie

my problem totally same like you... now still facing tis problem... duno how gonna fix it.. plan to bring back to maxis centre

Well they aren't exactly unstable just that the USB protocol only permits laptop/PC USB ports to supply up to 500mA at 5V (bus powered). Some are even lower due to the components and power distribution IC used. Unless one's laptop/PC has a powered USB port (self powered, with larger distribution of power) in which they can discharge up to 1000mA at 5V. So assuming you're using a standard USB port, charging at 500mA will take almost 2x as long when compared to using the provided charger/adapter. The adapter supplies up to 1000mA (or 1A) at 5V.

Which mean, to keep fully charge battery is recommended to prevent dead battery? Correct me if i'm wrong. Cuz i always plug in suka hati. afraid battery kong. 

BTW, thanks for the info guys.

Guys, I have a question.. I am currently using iPhone 3GS JB'ed... I found out 1 of the causes of my battery draining very fast is because of the processes running in the background.. For example, after I checked mail n closed it, I still the mail process in the SB Settings, why is it so? And the iPod process is always on although I never turned it on... This is not good.. It's been draining my battery faster these days...