Well, most of the tips are based on PC desktop. For laptop, it will be kind of hard to do the above tips as you will need to know how to open up your laptop to check. The battery mentioned is the cmos battery located on the motherboard so you will need to dis-assemble the laptop to be able to see it.
Here is a link that you can try the method:
How to Bypass BIOS Passwords
No guarantee though.