The inside of a computer is a bad place full of electricity and sharp edges. On the electricity side always when working on you computer make sure that it’s still plugged in to the power socket and the power is turned off, this is to ensure that any static From you is discharged through the earth. The inside of most computer cases are unfinished metal and has very sharp edges so be careful.
The first signs of a battery failing are:-
1) your clock starts running slowly
2) when you boot (start) your computer it has a problem finding your hardware (no hard drive, no cd rom)
To change the battery you need the following tools:-
1) a X-point screwdriver
2) an anti-static strap(optional)
3) a new battery (seems logical)
Then unplug all the cables from the back of the computer as you remove them make a note where they came from. (So when you finished you can put them back)
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