New battery stopped being detected

Changed my laptop's battery and calibrated it as per the instructions, and everything worked perfectly. A few days later, it began to not detect it sometimes. Now it does not detect the new battery at all and only turns on when connected to the power cable. Tried unplugging and replugging the battery to see if the connection was off, and now not only does it only turn on with the power cable, it won't turn on if the battery itself is plugged in as well. It ONLY turns on if 'power cable YES, battery NO'. When the battery is connected and the laptop is plugged in the laptop WON'T turn on, only make some internal noises. Battery report shows that there is no battery installed, and shows how it stopped detecting it randomly. Uninstalling the battery driver didn't work. What on earth is going on????