Having problems with a broken monitor and BIOS

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Alright /g/ after spending the whole day looking for information and personally tweaking my laptop to try and achieve what I am after I come here defeated to ask for your help.
Before I continue my computer is an old Dell XPS l511z with a broken monitor (I use the hdmi cable with an external monitor) and a fucked battery.
The problem I have is the following, my laptop battery recently got fucked, like a week ago I tried to charge it and the laptop light blinks orange and it stays there all the time, when I disconnect the charger the laptop just shuts down because the battery is dead, now I wouldn't give a fuck about the battery if it just would be that but my laptop is a Dell and apparently they have a chip that when the battery gets damaged or the charger gets bad it forces your computer to work 30% with less CPU or more, I really don't know the number. And this shit is HORRIBLE for using stuff like emulators, virtual computer, video editing etc.
So when I looked that up it seems I could bypass that shit of a problem with just tweaking some options on the BIOS. But here is the other problem, I cannot access the BIOS on my external monitor, the monitor only works after the OS boots. I have been looking all day since the morning for alternatives and answers, I have fully dismantled my laptop trying to disconnect the LCD cables so it forces the second monitor (did not work) and I just finished putting it all together again and give up.

My question is, is there a way I could access the BIOS feature on a secondary monitor? Someone told me to try pressing F9 while on the BIOS to restart the settings and force the screen but that did not work. I have a headache since an hour ago because of this shit. Would really appreciate any input or help besides the obvious which is getting a new monitor or computer ( I don't have the resources right now)

Pic related my shittop