Need to reset CMOS battery?

tl;dr botched BIOS flash, think I need to reset the CMOS battery but don't know how to go about doing it.

About a year ago I was handed-down a fairly new ASUS laptop from a family member. It worked fine, but there were problems with the internal clock and I had read this was a well documented problem with the model and BIOS and I had. So after extensively reading up on flashing, making sure I got the right version from ASUS's website and going through all the documentation, I went ahead and flashed it. It got to 100%, told me the flash was successful, and so I went to reboot. Wouldn't turn on, no light, nothing. Bricked.

After extensive searching of this problem, I found out that the new BIOS I wanted to install should not be located on an NTFS drive. This was nowhere in the documentation. So after looking into my problem, it seems to me that resetting the CMOS battery should be enough to get the computer turning on again. Problem is, I don't have the proper tool to do this. Can I bring it to the computer shop it was purchased from and have them do it simply and cheaply? Or do I have to send it back in to ASUS and if so, will they hold me liable?

Did you use the program that flashes the BIOS directly from Windows, Linux, or any other operating system that runs programs in protected mode?
If so, you had a higher risk (which seemed to have caught you this time), so you should have created a boot disk with the .bin BIOS flash tool directly booting or with MS-DOS and running nothing but the .com or 16-bit .exe BIOS flash tool.

There are two solutions now:
* Replace the motherboard with another one of the same model. If you don't know how to do this, send the laptop in to ASUS for them to do this.
* If you are willing to do something that can possibly void the warranty, take the motherboards out of the ASUS laptop and a working laptop with the same chipset, disassemble the two motherboards, swap the [[[E]E]P]ROM in the ASUS laptop's motherboard with the [[[E]E]P]ROM in the other same-chipset motherboard, reassemble the two motherboards, put them back into their respective laptops, and expect the ASUS laptop to work and the other laptop to not.