Why is my battery not detected?

I have a Razer Blade Stealth that used a non stock charger that has resulted in a bad battery. But with a new battery in it the battery percentage says 0%. The device works fine off the wall power. I have soldering equipment and a multi meter. How do i go about diagnosing the issue?

crwdns2893858:0crwdne2893858:0 crwdns2893862:0crwdne2893862:0


crwdns2889612:0crwdne2889612:0 0