Hello everyone,really need your help and advise plz,im a new user of iphone...i got some problem here. plz

iPhone Generation : Iphone 3g 8gb
Unlocked? (or Part Number): MB489B unlocked.
Current Firmware : 3.1.2
Current network: (Digi)
iTunes Version : 9
PC/MAC : PC
Jailbreaking software : Cydia? not sure. sorry.
Problem Encountered :

1. Battery drain very fast. every time have to charge coz i can see the battery decrease so fast. How long for the normal use of iphone act?

2. Cannot charge my phone when its empty.When the first time i charged my phone,its already 0%,so i tried to charge with my charger(2 pin charger) but the logo of thunder and battery(with a few red colour) appeared. i wait till next morning but the battery still not charge. I called the seller and he said maybe it is because my Digi sim card(is it logic?), then i tried with usb cable and it is ok. but then i go to change from the seller with the other charger(also 2 pin charger),still got same problem when my batt. empty.

Is it because of my jailbreak? or i have to change to 3 pin charger,it still same rite? i dun want it to be the same result.

Steps Taken So Far :

1. OFF SSH, install SBS, off Wifi, Bluetooth, 3G, and so on like in youtube video. (how to increasing battery life)

2. Tried hard reset, nothings happpen.

Other Information/Remarks : i bought this from someone, its oversea set. And the problem is there are no waranty, but the seller give 3month personal waranty to me. Its a new iphone. already jailbreak.

PLease do help me either text or pm me.
thanks a lot.

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Added on January 5, 2010, 5:28 pm

You phone now can turn on or still empty battery?

If cydia in ur apps board then it edy JB. My Iphone 3GS can stand 10Hours with everything are on. 3G/Wifi/Push Notify

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my phone can turn on now,charged with usb cable only,can charge with it...so is it my charger got prob or my phone?