Laptop works with power connector but not on battery. Battery is fine.

Over the past years I have taken my Asus N76VB laptop apart a few times to replace broken components. Currently my laptop is no longer running on battery and assuming it was because of an old battery, I replaced it. This however did not solve the problem. It works fine on net power.

I’ve disassembled the laptop to see if there were scorch marks or other traces suggesting there is a problem from the battery connector to the print board. Nothing to see there. The nine pin connector that goes in the battery looks fine.

I do have a multimeter, but I don’t know what to measure for. Who can help me in the right direction?