Removing power on password dell inspiron 1545

ive done that before by just taking out the little battery and powering the board up

What you need to do is either put a jumper on the CMOS reset pins (see the MOBO manual for the location on your specific MOBO) or as stated above remove the CMOS battery and press the on button to clear the CMOS - that should remove the password and reset the MOBO to defaults.

Folks, we're talking about a laptop... there are some BIOS/CMOS password cracking software with UBCD4Windows...otherwise pull the laptop battery and remove the CMOS battery, usually under the keyboard, and wait a few days for the various capacitors to discharge...

or you can power it up without the battery or AC power that'll drain it.

Yeah pull the little battery out of the mother bored make sure you no where the clips are 1st dont wanna break a clip. but best and easy way

To do so, you will need to remove the keyboard, palmrest and system board.