I Have An Asus B53j Laptop. Where Do I Find The Cmos Battery?

If it fails, then try to remove the battery for at least one hour.

However, in most motherboards CMOS battery is soldered, which makes it difficult to remove the battery. In this case we use another method.

Amost all motherboards contain a jumper that can clear all CMOS settings along with the BIOS password. The location of this jumper varies depending upon the motherboard brand. You should read your motherboard manual to check its location. If you don't have the manual then look for the jumpers near the CMOS battery. Most of the manufacturer label the jumper as CLR, CLEAR, CLEAR CMOS, etc.

When you find the jumper, look carefully.  There will be 3 pins and the jumper will be joining the center pin to either left or right pin. What you need to do, is remove the jumper and join the center pin to the opposite pin. e.g. if the jumper joins center pin to left pin, then remove it and join center pin to right pin. Now wait for a few seconds and then again remove the jumper and join the center pin to left pin.

Make sure to turn the PC off before opening the cabinet and resetting the jumper.

or

if you are not able to do this then try this software:

http://www.majorgeeks.com/download2969.html

or

Try using Backdoor BIOS Password:

Some BIOS manufacturer put a backdoor password in BIOS which always works irrespective of what password you have set in BIOS. Its a master password which is used for testing and troubleshooting purposes.

AMI BIOS Passwords:

    A.M.I.
    AAAMMMIII
    AMI?SW
    AMI_SW
    AMI
    BIOS
    CONDO
    HEWITT RAND
    LKWPETER
    MI
    Oder
    PASSWORD

AWARD BIOS Passwords:

    01322222
    589589
    589721
    595595
    598598
    ALFAROME
    ALLy
    aLLy
    aLLY
    ALLY
    aPAf
    _award
    award
    AWARD_SW
    AWARD?SW
    AWARD SW
    AWARD PW
    AWKWARD
    awkward
    BIOSTAR
    CONCAT
    CONDO
    Condo
    d8on
    djonet
    HLT
    J64
    J256
    J262
    j332
    j322
    KDD
    Lkwpeter
    LKWPETER
    PINT
    pint
    SER
    SKY_FOX
    SYXZ
    syxz
    shift + syxz
    TTPTHA
    ZAAADA
    ZBAAACA
    ZJAAADC

PHOENIX BIOS Passwords:

    BIOS
    CMOS
    phoenix
    PHOENIX

Misc Common Passwords:

    ALFAROME
    BIOSTAR
    biostar
    biosstar
    CMOS
    cmos
    LKWPETER
    lkwpeter
    setup
    SETUP
    Syxz
    Wodj

Other Manufacturer BIOS Passwords:

    Biostar - Biostar
    Compaq - Compaq
    Dell - Dell
    Enox - xo11nE
    Epox - central
    Freetech - Posterie
    IWill - iwill
    Jetway - spooml
    Packard Bell - bell9
    QDI - QDI
    Siemens - SKY_FOX
    TMC - BIGO
    Toshiba - Toshiba
    VOBIS &  IBM - merlin

NOTE: All these passwords are case-sensitive and are changed from time to time by manufacturers.

or

try  using MS DOS Command:

This method works only if you have access to the system when its turned on because this method requires MS DOS. Open MS DOS from programs menu and provide following commands one bye one:

    debug
    o 70 2E
    o 71 FF
    quit

NOTE: The first character in the above commands is "O" and not the number 0.

After providing the above commands, restart your system and it should reset the CMOS Settings along with the BIOS password.

Good luck!