JBL boombox charging light blinking, but not charging

I recently bought a boombox from someone that had problems with charging while the light did flash when connected to the wall.

I figured it was the battery that was dead or a broken charger so I got those both new.

After installing the charging light still seems to come on, indicating that it is charging, but the charge doesn't increase.

When I checked the amperage going to the battery it only read 0.2A.

What could be causing this problem?