Is there a way to do a firmware update without being plugged into a power source?

I have a Macbook 2GHz Intel Core 2 Duo and the indicator light on the Magsafe power cord is not lighting up. I know the cord works because I have tried it on a different computer but it is only this macbook that it doesn't work on. I have reset the SMC. I do need to do a firmware update but when I try to do the update it the firmware it will not let me update because the computer doesn't know that its connected to a power source. When I look at the battery life indicator on the right hand corner it says that its calculating but never changes.
I was using the computer running on battery life and it turned off. I was able to turn the computer on. The computer powers on and off but i'm assuming its going to run the battery power. I don't have another battery to try on this computer. Are there any suggestions?
Firmware update 1.4 is what i'm trying to install

Is there a way to do a firmware update without being plugged into a power source?
No

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