Removing the battery will help if you want to delete your forgotten password. Once the battery is removed, this will erase the BIOS password as well as reset all the settings.

In older laptops it could still work. However, in newer laptops, the CMOS does not store the BIOS password.
For DELL brands inclusive of:
Dell Inspiron: B120 B130 500m 600m 630m
Dell XPS: M1210 M1330 M1710 M1730 M2010 M140 M170 Gen 2 Gen2
Dell Latitude: C600 C610 C640 C800
D400 D410 D500 D505 D510 D520 D610 D630 D630
640m 700m 710m 1100 1150 1300 E1405 1526 1535 1520
Vostro Notebook: 1400 A860
Dell Precision: M20 M40 M50 M60 M70 M90 M6300

Once the wrong BIOS password is entered, almost all laptops generate a hash code. From this hash code, the Master Password could be identified. There may be some exceptions too, where hash code will not be generated as in the case of IBM. Here, a programmer is required to read ROM memory. Some laptops have a DIP switch, a jumper to clear the BIOS password. So, if you don’t remember the password, it would be useful to see the manual.
This page enables you to create a Master password, with the help of Hash code for brands like ACER, Fujitsu, HP, Dell, Samsung and various other models as well.
This facility could be a bit expensive if obtained on ebay or even when provided by some service providers.
For instance, 0 is ideally a zero and not the same as O. It is also key to calculate the Master password for American Keyboards as well.