Want to directly turn Toshiba laptop on by adding power to the prongs where battery goes

[32bland]

Can I power up Toshiba laptop from battery port

 

[USAFRet]

Can I power up Toshiba laptop from battery port

If you're asking this question, no, you cannot do it.

"adding power to the prongs"...from what? The wall?
You'd need a voltage converter. The battery connection accepts whatever voltage the battery would supply.
A wire straight from the wall would kill that.

But if you're thinking of rewiring the battery port, you already know this.